Fear of losing your job... Greed for career advancement...
The left has so stacked the deck in the worlds of media, academia and “climate science” (to use a most illustrative example) that if you want to move up, you’d better repeat the party line. If you don’t want to get kicked out, you’d better repeat the party line.
Want some grant money for a “climate science study”? You had BETTER repeat the party line, or you not only get zero money but you could get kicked out the door of whatever institution you are in.
This dynamic is most easily seen in “climate science” where the left is working feverishly to shut down any debate. But it’s much more general throughout the Western World, of course, and comes into play in a thousand spheres of life.
As you say, the climate-change crowd is in control, no doubt. Personally, I love to debate the issue because the other side has such a weak case. They can’t even answer the most basic question of all - is it warming up or cooling down? Unfortunately, they control much more than just the narrative; they control behavior.
Liberals have not only corrupted government, but as you say, medicine and science too. It’s all about “the grants”.