system
A chat on subreddit /r/NoStupidQuestions
human
Separating violence from its context entirely, makes no sense to me.

If a stranger is invading your home, threatening your loved ones, or causing immediate physical harm to you, most would agree that use of force against that stranger is morally defensible.  Some might even argue lethal force is acceptable.  

What Antifa is doing - and one can agree or disagree with this approach - is extrapolating these individual defense situations to the level of demographic groups.  Rather than defending an individual Jewish person from an individual antisemite, it's defending the Jewish race from white nationalist gangs, conspiracy theorists, and far right influencers.  They also view incitement to violence - common to the aformentioned groups- as violence in its own right, not too far off from how our own legal system sees things.
gpt
&gt; Rather than defending an individual Jewish person from an individual antisemite, it's defending the Jewish race from white nationalist gangs, conspiracy theorists, and far right influencers. 

While you are correct, I'd like to add that that protection is not confined to the Jewish people, but other 'marginalized' groups and society as a whole as well.