> Splitting hairs vis-a-vis "aggression" and "violence" might work well in your libertarian circles

I am certainly not a libertarian. Having said that, here is a scenario which clarifies the difference between "aggression" and "violence", imo - someone peacefully living in their home, when someone breaks in for a burglary. At that point, if the homeowner shoots and kills the burglar, that behavior is non-aggressive, violent and justified in my opinion.

So yes, definitely not hairsplitting and nothing to do with liberatarianism.