The 9/11 attack was a mass murder event.

Saying “America deserved 9/11” and “I’m okay with arsonists being killed by militias when the police can no longer maintain the peace” are both moral statements about mass casualty events — but neither is a call to commit a violent act.

> “if it takes someone committing mass murder to stop [serial arsonist gangs, when the police fail to stop them], it is justified”

This is clearly a statement of personal ethics — it’s discussing the cases in which the speaker believes violence is just, not calling for specific acts of violence.

I think you know that.