Sure we do — when society breaks down and the police can no longer maintain peace. As happened in a number of US cities this past year, when police were helpless in the face of Democrat-endorsed arsonists. Apparently, the speaker was from one of these cities that suffered from frequent, organized arson.
Regardless, we’re clearly having an ethical argument: there’s no call to violence.
> "mowing down dipshit protesters"
Your example is clearly not a call to action, it’s an example of an act the speaker would approve of if it happened — which is an ethical statement.
The speaker is not saying people should or asking people to mow down protestors: just that they’re okay with militias shooting arson gangs if that’s what’s required to stop their serial arson attacks.