People on the left have to default to sophistry and reductio ad absurdum like this.
As if breaking one law immediately invalidates his right to defend himself. I know thinking and good decision making isn't this idiots strong suit, but you can in fact carry more than one idea in your head at a time.
I can easily say, "Yes, he should be charged for breaking gun laws" and simultaneously say, "He defended himself from a mob that had clear intent to do great bodily harm and dispense their brand of justice." It's shocking, I know.
 
The reason they flail around acting like an unhinged lunatic while thinking they're making a point is because they don't actually have a point to make -- so they reduce any counterargument to laughably myopic parody in order to have even a semblance of a point.
No matter what level of obscene violence the mob worked itself into, people like this will justify it and try to Kafka trap the shooter.
You also can't speak about the sanctity of life when you have the flag of a movement or ideology whose very handbook condones violence for political purposes. I can use google and see for myself their stated goals and motivations. Even Wikipedia -- an organization whose former co-founder describes as left -- can't cover for them:

Described as a highly decentralized movement, antifa political activists are anti-racists who engage in protest tactics, seeking to combat fascists and racists such as neo-Nazis, white supremacists and other far-right extremists. This may sometimes involve digital activism, harassment, militancy, physical violence and property damage against those whom they identify as belonging to the far-right.

Rules for thee, but nor for me -- indeed, huh?

Even the author of their precious movement's handbook condones violence and self-defense:
https://archive.vn/aD9AD

Q. Do you personally think it’s okay for antifa members to arm themselves?
A. Yes. Self-defense is a legitimate response to fascist violence.

Let's not forget, the 17-year-old kid explicitly stated that he was there to support BLM.
 
It's already plainly obvious that this person is delusional, but it always helps when the publicly out themselves as such.
There's definitely someone here who looks like a clown -- on many levels.