Counterpoint: no matter how bad you think your life is, it's nowhere near as bad as it would be if a civil war occurred in your country.

Even people living a quite miserable life have a lot to lose.

This is obviously true now in places that aren't currently revolting, which is why they aren't revolting. But it can definitely get bad enough that it's worth gambling on the chance of a better life (as well as the chance of a worse life) vs. a guaranteed chance of a horrible life, or imminent death.