The truth can be quite the party pooper. Fictional works are only one example where a little denial, or "suspension of disbelief" as they call it, can really improve your enjoyment. If you consider this, it's suddenly easy to see why people like to live in denial of the truth. Some people just live in the greatest country of the world, depressing issues like climate change or COVID-19 don't exist and they can just live their life without worrying. It's almost tempting, thinking about it. It's the same type of temptation that led the character Cipher betray his friends in the movie "Matrix" (my favourite movie by the way).

Panel 1:
G and H are talking
H: Everything going on right now makes me so angry. People voting for fascists, denying the pandemic or climate change ... I don’t get it.
G: Everyone has to choose how much truth they can handle.
Panel 2:
H: What do you mean? Do you think it’s ok for people to live in denial like that?
G: Well, I don’t think you can handle the full truth either...
H: What? Yes, I can!
Panel 3:
G: running off Well, ... Avatar is just Pocahontas with blue people, Bruce Wayne could have done more useful things with his money if he really wanted to help people ... oh ... and chickens actually can’t taste sweetness.
H: looking shocked No!