Well looked at what has always happened in society when young people have no hope for the future: massive societal disruption mostly in the forms of revolution + violence.

Since this isn't the 1800s anymore there won't be any major revolutions but I expect way more societal violence going forward. If you have no hope for the future it's not hard to go to very dark paths quickly, usually through no fault of your own sadly.

Now add how easy it is for malicious actors to get an audience and how LLM tech makes this even easier to do. Nice recipe for a powder keg.