I think that by cynically mocking the “Drug Free Zone” sign, I attacked one of the moonbats’ basic tenets of faith, and that is that government is good and does well intentioned things. I base this on the following exchanges with this guy, who at that point was a new member of our team. Next, by the way, I told him that I’d never buy a GM car, only to learn later that his dad was an exec at that very corporation. An auspicious beginning it wasn’t, and things between us didn’t proceed like (presumably ) those between Rick and Louie in Casablanca.
I try to be circumspect when the truth about a particular situation (not an aggregate) is unknown. It avoids looking like an ass, which can hurt my credibility and lessen the good that I can do.
To cut to the heart of the matter, Liberals don't really care so much if a policy or sign or whatever is effective, it is a question of how the policy, etc. makes them feel.
You splattered the feelgood all over with a concise dose of reality, and that is an unpardonable sacrilege to those folks.