You do know that Antifa stands for Anti Fascism and is a political movement not a defined group, right?
Antifa started in Eastern Germany in the 30s to spread communism worldwide. They also called conservatives "fascists" which would provide them a convenient scapegoat to commit violence.
Is this you?
> Antifa, who is a violent political extremist group.
Seems like the trope is actually you calling antifa "violent", despite all evidence to the contrary, so you can justify violence against peaceful protestors.