Riots are indiscriminate almost by definition. Has there ever been a riot whose targeted damage outpaced its collateral damage? We can imagine such a thing, but if it's not practically likely to ever occur I don't know what the point would be of developing theories about it.

On the other hand it's very straightforward to locate some justified wars in history. In fact I would say that most wars have a side that has a just cause, which is typically the defender.