Sometimes being an idiot is a good thing.
If you think too much you can become unhappy, looking at your situation, work becomes torture, all the unrealized dreams you have, the costs of life, you get downhearted and you think your way into believing things are bad.
Whereas... Koalas seem kind of happy don't they? Waddling around past a human like they're nothing, climbing a tree, eating Eucalyptus leaves for hours, sleeping, having a little bit of a roll around fight, biting someone's bum to get them out of "your tree", drinking water out of someone's pool, you want sex? Take it! Kinda nice life if I'm honest.
You've seen certain people out in the World, they're plodding along working their little job, they're quite content as long as they can support their little sports team.
Other people blot out the pain in their lives with weed or some other drug, they self-medicate their problems away, you've heard them drawling away in voice chat in video games about nothing but it seems to amuse them.
People who fixate on IQ tests as the be-all-and-end-all are in my opinion cursed.