Probably something to do with people having no confidence in the government or the police and no connection to those that make the policy that effects their lives or those who are sent to enforce that policy. Maybe to do with people see a genuinely bleak future while those entrusted to represent them live the highlife and play fast and loose with their families, communities and livelihoods. Might be somehting to do with frustration at being powerless to change their lives and the situation that they find themselves in which cycles endless from generation to generation.
Possibly. Or maybe it's just a bunch of criminal twats who've seen the opportunity to nick as much as possible. Visit Soweto and see what a shit life's really like - and the majority of the people there would share their last mouthful of food with you. There is no excuse. They're pathetic morons.