Maybe I haven't got my finger on the pulse, but I can't imagine mass riots if Rittenhouse is found not guilty.
Yeah the two people he killed were white and both of them are pretty scummy people too - one anally raped several young boys and the other was into kidnapping women. Might be some protests/outrage but can't see much in the way of mass rioting over the verdict.
The whole situation is stupid. Allowing a child to take a weapon of war on to the streets during a riot is stupid, no way he is emotionally mature enough to deal with what might happen. The police not doing their jobs and instead allowing members of the public to act as vigilantes is stupid. Members of the public burning their own city is about as stupid as it gets.
In which case they should pass laws in relation to taking weapons to protests etc... though I guess that doesn't prevent say a business owner (or people they invite) having firearms on their property - such a law might have simply meant Rittenhouse and chums were restricted to remaining on the properties if carrying firearms.