It is a curious reaction, but it starts to make sense if some of these posters are running ops for intelligence agencies. Balaji Srinivasan noted that as the US started pulling out of foreign wars, the intelligence apparatus would be turned inward domestically.

Some of it can also be attributed to ideological reasons, the d/acc crowd for example. Please note I am not attacking any individual poster, but speculating on the reasons why someone might refuse to acknowledge the truth, even when presented evidence to the contrary.