Why are people (leftists) so afraid of disagreement they feel the need to ban and block opinions they disagree with?

Anonymous

We saw it after the BLM thing with how news sites started to remove their comment sections to get ridd of disagreeing opinions or how presidental jokes in general became a huge nono after Biden became president.

Why are people (leftists) so afraid of disagreement they feel the need to ban and block opinions they disagree with?
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