And there are women who rape women as well.
On to the riots bit!
Andir, I don't think the issue is stuff, so much, for most of the rioters. It's broken promises. When you put your trust in someone or something, and it responds by basically giving you the old heave ho, of course you're going to be pissed off. Especially if its something major like university you've been sort of building your life plans around. It's a betrayal.
To give a more personal example from my own life - Imagine your getting married. The brides father insists on paying for the photographer and venue. You say thats not necessary, but he convinces you, and plans get made based on certain expeditions.
He then refuses to pay for either of the two, deciding after the fact that he shouldn't be responsible, and the couple only find this out after multiple calls, late in the process, when they suddenly find themselves with no venue or photographer, and the need to get one on short notice with costs far exceeding what was originally intended. Even if they make it work...
You can't see how this would cause a schism, would cause tension and anger? It's not that this couple felt entitled to this stuff, it's that they felt like they were treated like shit by someone they put their trust in. They had built plans around those promises. Like so much of life, I imagine the happiness or lack thereof isn't caused by the actual stuff, but by the disconnect by what is expected, deserved, promised, and what actually occurs.