Definitely not my experience in academia, mostly small mini czardoms who can't stand and won't speak to their competitors. Often engaged in ancient blood feuds with the person two doors down. Add a dash of corruption in publishing and citing each others works while excluding those they disagree with etc.

Well, you can have certain differences of opinion as long as they're "acceptable" opinions. Academia ousts those who don't fit into its culture. Tenure is the only way you can express your real opinion without reprisal, though you may still be socially outcast for having the "wrong" opinion - and those who make it this far are predominantly products of that same culture - their opinions align with their peers on what is deemed acceptable. The anointed.