Getting O'reilly canned is as much about tribalism as is the left shutting down non-progressive speakers on college campuses, while conservatives seek to be heard.
Its about the left trying to silence what they believe are influential voices proffering an alternative point of view. The left refuses to live in a world where a competing worldview exists. Never could, never will.
The left thinks O'reilly is the apex of conservative thought, and that they are somehow advancing their cause by his removal. Thats how dense they are.