Why the overtly personal take? Why the italics? Why the hyperbole? Why all the fuss? Can't these things be discussed without undue passion?
any captain whose ship is disabled while under direct enemy attack and orders his crew to abandon ship to the surface of a planet that is about to be destroyed is (by your definition) utterly insane.
Indeed. This may be due to severe mental deficiency, or then hidden knowledge that there is in fact some sense in the action.
Decker wouldn't have any reason to think the planet would be spared, not after looking at half a dozen systems turned into rubble already. At most, he might have hidden knowledge that the planet killer could be stopped if the crew were to be sent away from the ship (even to the deadly planet if necessary) and a single expendable pilot were to perform a suicidal mission. Which is what I very much like to postulate, considering that this
is what Decker later attempts, and what eventually succeeds in crippling the DDM.
If I don't suggest this,
then the only choice left is that Decker is a maniacal villain. And that's not a path I want to take.
That statement defies all logic considering that in those exact same circumstances Kirk made pretty much the exact same choices
As far as ST3:TSfS goes, Kirk had no knowledge that the planet was about to break up. Moreover, he was aware that Klingons were holding hostages down there. And ultimately, he was trying to get to that planet, to retrieve Spock's body (and now that of his son as well).
So I can see absolutely no merit to your argument in this respect. Sorry.
if the path of destruction is not parallel in any way with the plane of our galaxy, and starts near the upper or lower boundary of the galactic disk, then one could assume that it came from outside.
If the path really began at the upper or lower boundary (such things exist in the Trek galaxy although not really in ours), this might be true. However, we get no such indication from the episode. It would be a nice addition, of course, but surely that belongs to the fanfic section?
In terms of distances normally traversed by our heroes, the snippet of path they explored could at very most give them a line of search for the points of origin and destination. And unless that line was absolutely straight (and I cannot see how it could be, as no neighboring star systems would naturally lie in a straight line) the errors would be staggering.
This is really a minor technical-treknological nitpick, far from having the plot effects that the why-did-Decker-strand-the-crew thing does. But it's IMHO worth mentioning anyway. It has at least the following consequences:
If our heroes really have surveyed a line of destruction that has some statistical significance - say, a line a thousand lightyears long - then they must have visited hundreds of star systems. Surely the mood of the episode doesn't support this. Even the star system designations only suggest half a dozen systems visited.
Alternately, they have only visited half a dozen systems along a path a thousand lightyears long. But then they would have skipped a great many systems en route. And they would have no proof that the DDM doesn't skip systems as well. The theory about a benevolent probe that only eats lifeless systems could hold true, then, and Rigel would be under no threat.
But this is a common fallacy in all sorts of fiction. Trek does this in half a dozen other episodes later on, most recently in ENT "Regeneration" where our heroes only get the direction into which a Borg subspace message is sent, and immediately divine the distance to which it is aimed, and its arrival there. That just plain doesn't work unless additional knowledge exists - lines of search do not give points of origin or destination.
And your description of what was said as denser parts of our galaxy is not accurate, he stated that it was headed for the most densely populated parts of our own galaxy.
Oops, sorry. That's what I meant. Although it's probably the same thing.
..the Planet Killer must be able to reach warp speeds... just maybe not within the influence of a star system.
Excellent theory. Good material for fanfic.
Additionally, the Constellation doesn't need to follow at any great speed because the Enterprise and Planet Killer are engaged in a cat and mouse battle which kept both of them within range of the Constellation.
I don't really think this is sufficient excuse here. The order of events should be noted:
1) Heroes arrive, board
Constellation
2) DDM attacks, Spock raises shields, maneuvers a little bit
3) Spock gets back to
Constellation, lowers shields for retrieval of boarding party, gets blasted by DDM
4) Spock continues evasive, course not established; Kirk attempts engine repairs
5) Spock outruns DDM
6) DDM veers to new course, for the next system
7) Spock wants to double back to the
Constellation; apparently some separation has emerged between her and the
Enterprise at this stage

Decker overrules, begins attack; DDM seems to continue on course
9) Kirk finally gets the
Constellation moving, at slow impulse; the battle is within viewing range
10) The
Enterprise loses warp and veers off; but apparently, loss of warp would not have
necessitated abandoning the battle
11) DDM captures Decker's ship in tractor beam
12) Kirk reaches phaser range, frees Decker from tractor beam
13) DDM gives chase at impulse speed, eating rubble as it moves
14) Kirk gives chase at one third impulse
15) Decker steals shuttle, dives into DDM
16) DDM continues chase
17) Kirk dives into DDM in turn, destroying it
Of interest here is the chain of events from 6 to 11. During that time, the DDM gives no indication of folding back, or maneuvering, or even acknowledging Decker's futile attacks. That should put considerable separation between Kirk and Decker if the DDM and Decker maneuvered at warp, yet 12 shows this is not the case.
Furthermore, we already heard in 5 that Spock initially got rid of the DDM by outrunning it. That strongly implies that the DDM was slower than Spock, in simple, straight-line terms. Yet this straight race didn't suffice for putting distance between Spock and Kirk. Either it happened at relatively low speeds, or then it happened in a direction that was exactly cancelled by the course that the DDM later took towards Rigel.
Subsequently, and more damningly, 13 through 17 shows the DDM giving deliberate chase and still being overtaken by a ship that moves at one third impulse power. So we need some more fanfic here. Perhaps the DDM was playing sadistically with its prey? Or perhaps it knew that Spock's ship would soon lose fuel, and intended to take it easy until then? I'm at loss of other theories to justify 13-17 (except of course to say that the DDM at its very best could only do about 1/3 starship impulse speed). Any ideas?
Timo Saloniemi