"[L]et's remember we've actually seen a starfleet captain, on his own initiative, bomb a planet to drive out the population, and relieve no censure for it from Starfleet. We've seen no such thing in canonical star wars {...} two out of the four main Starfleet captains have given, in earnest, the order to destroy planets."
- NecronLord, 2016-0614, "Have Trekkies used these arguments?", bbs.stardestroyer.net
That is an impressive point when put that way. Of course, using statistics ("two out of the four main") is a bit wrong-headed since we were shown rather more interesting characters than mere bog-standard Starfleet captains. I rather doubt Captain Isao Telaka had a log entry more interesting than a complaint about someone's manners, for instance.
And indeed, all four Federation Starfleet captains we followed made some rather hardcore choices.