I've never seem "V" but the scenario you described doesn't seem equivalent.
Also, "the greater good" is NOT the same thing as "might makes right."
I disagree, The Baku don't answer to Starfleet, they owed them nothing. They said NO to relations. Kirk (And most every other Captain we've seen in Star Fleet) always told us that "NO" meant the Federation would go away, and take nothing from you, or exact any price for rejection. So, an Independent Society, who said no to the Almighty Starfleet, is ignored when they say no, and Forced to comply, through might, because they had the audacity to not join up or bow down to the Federation? This isn't a colony, or a territory we're talking about here, it's an Independent Society, not beholden to the decisions of the Federation. Starfleet taking what they want, without consent, and after refusal, is a brutal act of Invasion/War
Sure, you could make all these claims, if they were Federation Citizens or Protectorates, but, they're not, they're outsiders, that have chosen not to bask in the benevolence of the Federation, and are being bullied
Again, in most circumstances, I'd agree with you. The UFP doesn't go around stealing planets and relocating cultures just to get something it wants.
But there are exceptions to rules and this situation is one of them for many reasons:
1. The Baku aren't native to the planet
2. They are an artificial "culture" of 600, only sustained in their way of life by the magical properties of the planet.
3. The Son'a have just as much right to the planet as they do, and the Son'a were partners of the Federation
All that doesn't even touch on the larger issue of again, whether the property rights of a tiny minority outweighs the improved well-being of billions across the galaxy. For me, obviously, the answer is that the well-being of billions outweighs property rights of a group that's not even native to the planet.
It's interesting to see so many argue the opposite, though-I wonder if people would argue the same way in the abstract, and removed from the specific scenario of a Star Trek movie.
I'm not really sure why it matters if they're native to the Planet? They've been living there for 300 years, I believe. How many Federation Colonies are there, where the Citizens aren't native and have only lived there 50 or 100 years? So, if one of those Federation Colonies is the only place that will grow a certain flower, that will cure a plague The Romulans are fighting, is it cool for the Romulans to take that Planet?
What kind of defense is it that they're only maintained by the "Magical Properties of the planet"? Seems to me that's a reason not to move them, because you'll be killing them.
As far as the Son'a having a claim to the planet as well, well, I didn't see The Federation helping the Bajorans get rid of their invaders, who were actually already enemies of the Federation