Since when does supporting the righting of an injustice require you to also support rioting? I'm sorry, that just doesn't logically follow. You're confusing the tactics of a tiny minority with the substance or a huge movement.
> Riots, on the other hand, seem to cause the media hordes to descend and at least draw attention to the cause. It's hard to argue the fact that they are at least useful for consciousness -raising.
Although 'effective', or in this case 'useful' definitely does not have to be a synonym for "a positive thing", as you state.
It's possible to separate the benefit of increased awareness from the negativity of the event in question. Your spin is more akin to "people think riots are good".