In most countries, the poor are significantly less likely to vote regardless of the circumstances. This is only to be expected as getting involved in the political process usually requires expending time and money that the poor simply do not have. Also, the better-off will, because they have time and resources to spare that the poor do not, be more effective in pushing their agenda anyway, leading to a fundamental disenchantment with politics that leads many people to not even bother voting. Finally, if most people in a country are well-off enough, the poor might not be able to improve their position through democratic means no matter how nicely and legally they acted.
Now this may not matter if the political elites do enough to help provide opportunities for better jobs / higher income, or just make sure to throw around enough bread and games to keep the poor pacified, but if they failed in that respect, I wouldn't expect an organized political campaign against poverty to emerge.
(added a 'not' in the sentence because I think that's what you mean)
For most people, violence is a last resort. Same here. Nothing excuses looting and shooting cops, but I'd say it's more productive to look at a long term solution - which will require coopting local community leaders to find out what needs to be done - than marching in with all guns blazing; that's just fighting the symptoms, quite likely antagonizing those who didn't take part in the riots, and guaranteeing that they will flare up again, if not tomorrow then maybe next year.