I'm fairly concerned about stochastic terrorism, but I'd disagree about that comment. Reading it in context, I'd say the author has some inaccurate views about how often people will turn to murder rather than pay court fees, but... it's not the same thing as saying "someone should do X."
I think I get what you're getting at, but I see a pretty big difference between a random internet comment and a person of actual power saying "Ayyy, it sure would make me happy if so and so just, ya know, got taken care of"
When the identities of random internet commenters are difficult to establish, and may themselves represent larger interests or entities, there's some concern with that viewpoint.
Some people I'm neutral toward find that priest, who I am also neutral toward, quite turbulent. I wonder if any of them would go so far as taking drastic action against him.