See third word of your title.

What? Drinking? Sleeping with each other's wives and then complaining about how cruel and unkind the world is because their friend is mad at them for some reason?

Being French?

Doing what? Amphetamines?

philosophers are all fucking weird (derogatory)

signing letters supporting pedophilia? beats me.

Failing to reconcile their individualist existentialism with their political commitment to communism? It's not that easy, but Simon De Beauvoir kind of did it.

You can use pretense of reason to justify anything. That's why you need actual material analysis