R. Star wrote:

In Star Trek death is but a temporary inconvienence. (if you're a main character, if you're a redshirt you're screwed)
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And that's the problem. It shouldn't be that way, and any time they resurrect a dead character, it perpetuates that impression.
ETA:
Now, hell, I'm not trying to be an absolutist here. There are occasions where a resurrection can work in so many other ways that it outweighs the problem of undermining the threat of death in the narrative. Trip in
Enterprise: The Good That Men Do is one example of that, and Janeway's resurrection in
Voyager: The Eternal Tide may be as well. (I haven't read it yet, so I don't have an opinion on whether or not her resurrection's virtues outweigh the problem of undermining death.)
But that means that when a creator
does break the law of mortality and bring back a dead character, they should be that much more reluctant to do it again. It should be a rare and exceptional thing when that happens, and it should cost the characters or the narrative somehow. (I've often thought one of the brilliant things
Star Trek III did was to offset the resurrection of Spock by killing Kirk's son and destroying the original
Enterprise.)
ETA #2:
See
this video on YouTube for a humorous discussion of how damaging it can be to a franchise when resurrections become common.