The Onion

I beleive empathy is the root of this difference. With more empathy, you can better understand how someone else might feel - why they may struggle with a situation you breeze through. Empathy pushes people left. Empathy also helps you read the room and better calculate what gets a better reaction to comedy. It helps actors get into character to live as someone else. Conservative actors get typecast quickly, often as some tough, blunt hero-of-every-story character because that's all they can aspire to be. Conservative comedians lean on an outgroup being the punchline whereas the rest of them tend to be the butt of their own joke or just describe situations. So yeah, 90% of the punchlines there will be that some type of person exists and does what a bigot expects them to do as part of their stereotype.

Robert de Niro went to theater school and played badass mafia roles. Joe Pesci was a NYC tough guy before playing one in movies. Alec Baldwin went to theater school before playing extraordinarily serious roles. Steven Segal... Just watch his karate competitions.