Because games just aren't the same without forensic psychiatrists and socio-paths.

I think you're forgetting something.

You know those survival games that are multi-player only? They seem to always turn into toxic cesspits after a while. A pity as some of the better ones look like they could have been fun if there was a single-player mode.

I am pretty sure the OP is sarcastic.

Sometimes (rarely) the dialog in Team Fortress 2 chat makes me chuckle though:

Person A (angrily): "I'll f*** your mother!"
Person B: "Dad?"

Person A (sadly): "I hate my life..."
Person B: "That's ok, I hate your life too."

Person A (cheerily): "Merry Christmas everyone!"
Person B: "Yeah yeah f*** you too..."

Person A: "Is that guy cheating? He gets a headshot at me every time!"
Person B: "Maybe you just have an awfully big head?"

Person A: "Anyone wanna trade?"
Person B: "Your mother wanted to trade when you were born!"

etc.