I have watched a couple of series of riots in Los Angeles, and those situations require both high capacity magazines and semiauto rifles.
Magazines because you may have multiple attackers (called a mob) and one misses occasionally.
Semiauto because engagement distances are short, and likely should be. With a bolt gun, you have to decide to fire at some longer distance, perhaps without seeing the clear intent, rather than waiting. This increases the likelihood of firing on people who may not actually pose a danger to you. Rioters don't usually wear uniforms.
Relatively short engagement distances also call for more rounds in the magazine, as time to act could be rather short. Taking time to reload multiple times might be a big difference.
Given the uncertainties involved, it is hard to predict with accuracy what anyone might need. Individuals should be free to select their path as they see fit.
Loyalty to petrified opinions never yet broke a chain or freed a human soul in this world — and never will.
— Mark Twain