IMO it's because people have fragile egos / worldviews they don't want shaken. Pretty much any opinion I type on this website gets instantly downvoted, unless it reaffirms the popular / mainstream narrative, because I happen to see the world differently than most.

This website is quite awful, and I also don't know why I spend any time on it. It's definitely not a website intended for meaningful discourse. It's a website where you can reaffirm whatever opinion is already established, and if your opinion is at all controversial or even just out of the box, you'll be punished for it.