Psychology explains why — for so many of us — these stars of kiddie birthday parties and peddlers of good, clean fun are truly no laughing matter — Trigger Warning: This article contains references to painted white faces, red foam noses, and receding hairlines with tufts of wild hair. Please engage in self-care while reading. Not so long ago, across at least 10 different states, creepy clowns terrorized America. In Florida, fiendish clowns were spotted lurking by the…