Exactly. Idealists know, that when they engage with material evidence that doesn't fit their narrative, their worldview will get weakened in their own brain. So they have to terminate their thoughts.

And the more material evidence is on an instance, the more thought-termination per idealist there will be. An approximate formula would be:

amount of thought termination on a particular instance = amount of facts on that instance that idealists disagree with * amount of idealists (including federated ones browsing on all-sort)

which I'd assume makes lemmy the number one.