Just Google the paradox of tolerance. It's really not as complicated as you're making it out to be.
Also, punching Nazis is always morally correct. If you wouldn't attack a nazi because they're not currently threatening you specifically then you won't develop any additional moral prerogative in time of civil war - you'll join them, because they're still not threatening you specifically, while fair and equal redistribution of resources will effect you. You don't have any sort of morality or ideology underlying your objection, you just think extreme things are bad because you're not given a choice.