No man Mafia has never been about friendship and only about mutual deterrence through violence. Almost as the government does. Anyone in a middle level position keep enforcing bad stuff in order to avoid losing their partial privilege.

the whole world is a huge friendship but add backstabbing to it

Traitors go to the deeper level of hell. Real friends never backstab because they have the higher knowledge of mutual help. How many can you find in life? Not more than 4-5 I bet.