Okay. So.
Why is the effing light side's immediate response to everything "blow it the f*ck up?"
For the good guys, they go to the murder solution real quick.
If fin was kidnapped & brainwashed, then so are most of the other storm troopers. In which case, screw you, resistance! They don't even try to save any of them. If the new Death Star is 37 times bigger than the old one, in order to crew it, that would mean the rebels killed a whole planet worth of people too. And yet they're the light.
Using your Jedi powers out of anger is dark side, but murdering people any other way is fine?