what are some of these ideas?

Communism is a big one, but pretty much anything left-wing. Right wingers are socialists too. It seems that collectivist thought may be instinctive in people.

There are also many ideas that draw people into cults and abusive relationships and these come in a wide variety.

sometimes collectivism is pursued for survival not self-destruction. many people had to make a choice between fascism or communism back in the day... to not choose would have been end game

when things go bad people sort into tribes... like in prison. even people who in normal times would have preferred not to

what is optimal gini for information spread among people?