I'm not sure. I have different hypotheses. It's probably different reasons for different people.

• Some people are just like "I don't like talking politics." Maybe these people have had bad experiences talking about these things. I can see that. Some of the "conspiracy theorists" (who I would say are partially or even mostly correct), do come off very strongly and aggressively, making people feel uncomfortable.
• Some people have a hard time admitting the possibility of things that would force them to admit they're wrong / deceived / make them feel bad. We all know people like this. Even if the evidence is overwhelming, they simply will not accept something that makes them look bad or feel bad. These people are probably motivated by pride.
• Some people are intellectually lazy. Even if something is plausible or true, they don't really want to expend any effort thinking about. If it requires them to put effort into changing how they live or how they think, they're not really interested in engaging with it. These people probably have other things going on in their lives that are more important to them.

In the end though, people will change when they feel like it will improve their lives. Part of the problem of acknowledging the truth about power is that it doesn't always have very practical implications. For the average pleb, probably the best way to a peaceful life is actually to give in to the regime's lies. Acknowledging the truth about their lies doesn't mean much if you can't do anything about it.

As bitcoiners, hopefully we can help people feel at least a small way that they can take back some of that power, by being financially self sovereign.