I think the biggest issue is that we don't know what to do when we're mad anymore. People think that being mad is all you need - that if you say you're mad, things will change. I often see people get pissed about something, then calm down and move on, as if they somehow achieved something with their anger alone.
I'm hoping that there's some pressure going on under the surface, and people will eventually reach a point where enough anger has built up that they can't take it anymore and they really take action, but from what I've seen, people are so against the concept of acting upon angry feelings that I worry they'll just hold it in until they die.