Riots are very low risk for most people, especially compared to blackouts, tornados, hurricanes, winter storms, home invasion, medical emergencies, etc. Sure, this depends on your location and contemporary events, but I daresay you'll do well to make sure you don't neglect preparing for other more likely situations. Besides, if you're prepared for those, you're halfway to being prepared for a riot.

In my location, I'd reckon that a nuclear disaster is more likely than a riot. So I don't bother with specialized preparation for riots at all.

I think we're talking about it either because we've talked out the other more probably scenarios, or because we're scared irrationally.