Groupthink. That’s fundamentally what liberalism is all about. Its nothing if not indoctrination, brainwashing and conformity to its orthodoxy. Its purely an emotion based ideology and anyone with different views is summarily dismissed or attacked.
Liberals are not just adherents, they are intolerant believers. If you dissent, you’re effectively excommunicated.
They all resort to attacking the messenger and hoping to gang up as a majority collective to destroy dissent.
Liberalism is a peer enforced belief.