That's because I always watch high-quality educational content and some beautiful comforting and inspiring music. So for me YouTube is a fountain of knowledge, visual and musical aesthetics etc. Every day I get inspiration, healthy kind of fun and learn something cool, useful and healthy.
But people who watch stupid and destructive stuff (even once) are doomed because they are going to get the same and worse kind of content recommended over and over. This is a particularly underestimated social problem indeed.
That's why I recommend to avoid signing-in into YouTube. Better watch anonymously so you can always clean the cookies and get out of the pit.