Two reasons:

For most young people, there is no future and they are hopeless, at least here in the US. Their choices are the military, a lifetime of debt, or working multiple jobs at 100+ hours a week to pay for a life that is so price-gouged our grandparents wouldn't recognize it. Most will never own a home or be able to afford a family, and the older generations consider them a failure for circumstances over which they had no control.

The second reason is that social media algorithms have proven to be both addictive and exceedingly good at modifying the way people think, and people that are always angry and utterly convinced that everything they think is correct will keep their eyeballs glued to ads.