The key being AFTER everyone had died, not when there was time to rescue them whether they wanted it or not. Never mind the distictly unfederation firing of weapons at a ship in critical distress. Kirk tells Nero he can't possibly save himself, in other words the nerada is screwed and thn we shoot at it.
Heroic, no?
Well, if you want to take the chance it spits Nero out somewhere else in history in anything other than tiny pieces, you do that. I prefer fewer starships blowing up when they shouldn't, myself.
I'd prefer tractoring them out and forcing them to face justice in the time they committed there crimes than the murder of a crew of hundreds, potentially thousands, that were mostly guilty of following the orders of there commanding officer and attempting, albeit in a rather destructive way, to save there homeworld.
You say PotAto I say Potato...........................