Why do people have beliefs that are clearly ridiculous?

I ask because I just don't understand this; I'm genuinely confused. For example, the belief that many now apparently have that the Earth is flat! Seriously? Are these people just trolling us? Is this all some big joke that I'm not aware of?
My sister often watches this YouTube channel, and I have to say it is full of batshit crazy nonsense of the highest calibre!

https://www.youtube.com/@minutesofhorror/videos

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PalteseMalconFunch · 36-40, T Best Comment

It fills some other need, they don’t really believe that actual thing. Or rather the actual truth of the thing isn’t what matters

What matters is how it being true makes them feel

It doesn’t matter to them if the Earth is flat or not. What matters is that they’ve been lied to but we’re smart enough to wake up and see what others couldn’t

Or it’s a comforting proof of God

In their minds at least

Pambie · 22-25, F

@PalteseMalconFunch I think this might be the answer. It isn't about what's true, but about what "feels right" which, I have to admit, is just batshit bonkers from my perspective. I'd always rather know the truth, especially when it's upsetting or inconvenient.

PalteseMalconFunch · 36-40, T

@Pambie I spent a lot of time with flat earthers because I wanted to understand