Perhaps they aren't qualified to do anything that needs to be done whatsoever. Maybe they and their degrees are completely superfluous and unnecessary. Historically, the way to employ such educated sons was to either make them priests or send them to die in wars or to the colonies to get drunk and slaughter indigenous people; when all three of those strategies failed, societies with too many of them usually collapsed under stupid and poorly planned revolutions run by young rich idiots.

I think your dots almost connecting; your points are taken.

A fairly clear threat to any society is masses of un(der)employed young males. People with capability+ambition but no outlet.

So what about all those surplus advanced degrees ? What if they start an evil organisation along the lines of SPECTRE ?