Liberal are not good at common sense or thinking things through to their final conclusion. Their postings and activism are almost always based on emotional responses / knee-jerk reactions, the need for attention, and directed at whoever or whatever is denying them from doing something that is morally wrong not on rational reasoning and a sense of justice or what is right or wrong.
Honestly, I don't know how to reach liberals, they "feel" their way through life.
Reagan pointed out that liberals "know so much that isn't so".