Ergo, step 2 is irrelevant. We're not discussing the rest of the Star Trek franchise, just this specific movie.
No, we're discussing how this movie relates to the
Star Trek franchise. By the standards of a Saturday night Sciffy movie, it might be okay; by the standards of
Star Trek, it's garbage. Either way, it falls into the D&G category.
The question we're arguing is whether or not it falls into the 'D&G category', so your last sentence contradicted the first, because 'either way' this is the result.
Since 'either way' it is 'dark and gritty', we can dismiss the logic that Star Trek is adult and therefore it must be dark (and the further implicit assumption that it's adolescent but we'll judge it as if it is not).
In other words there are three gaping, practical and obvious logical flaws in this reasoning and I'm just getting started.
But hey, let's ignore those for a moment, just for the sake of argument. If the new Star Trek was made for an adult audience, it's still a fun, flashy film filled with good times, witty one liners, character banter and nostalgia. While the destruction of Vulcan may strike a discordant cord, it isn't enough to outweigh the general positive feelings and Star Wars-ish attitude of high adventure the film rather obviously conveys.
Thirdly, the destruction of a planet is pretty dark either way.
Presentation. Just because a planet blows up does not a dark and gritty make; and you can have a significantly smaller death toll (or none at all) and still have a dark and gritty film. Tone is
enormous in determining that.
"In The Pale Moonlight" is grim and gritty. nuTrek far more so.
This line practically speaks for itself.
The new movie is a fun romp, whatever the moral reservations one may have; it is clearly a little cheeky in places and has its fare share of knowing, nostalgic winks; "In the Pale Moonlight" is deathly serious, sombre, and grim. One would have to have a very peculiar mode of perception indeed to decide Abrams' flashy summer blockbuster was a darker affair then Sisko's soul-searching.
But, yes, their cavalier treatment of near-genocide was very disturbing, as far as I was concerned.
Disturbing, but does that merit their consideration as dark and gritty? In fact, dark and grittiness in BSG's case was a clear
reaction to the cavalier treatment of the scenario in the original series; people are laughing and going to the casino planet shortly after genocide - not on RDM's watch, that is certain. BSG is very helpful here in establishing an example of how tone and attitude of characters can change what is, broadly speaking, the same series of events - the annihilation of the Colonies by the Cylons - from the starting point of an action-adventure to a post-9/11-style catastrophy.