You are right spyman in that all the people who broke windows and stole stuff are criminals, that is the way the law is set up. I should have specified that there will always be a group of people who will join in the riots purely to steal and cause mayhem, not to show their anger at the way they have been treated (basically what you said, which is kinda what I meant).
As for the hypothetical, if you had been laid off, if your neighbourhood had suffered from budget cuts and lack of development for decades, if you or people you knew underwent daily abuse from the police, if you knew people who had died in police custody, if just had your life savings stripped away through a depression not of your causing, if the tax you have paid had been given to banks who promptly treated themselves to large bonuses and then you went and stole a TV (large numbers of rioters stole necessities, not everyone went after the TVs), then I would wholeheartedly support you.
Re Kaufman, a woman who stole a TV worth a similar amount was sentenced to 6 months.