At the same time

Both Side-ISM is only credible when there is Equivalence.

There is none in this case. What some idiot said to another fan resulting in mass Police violence is NOT Both-Side did wrong X domain stuff.

Bad-ness exists on a gradient. If your solution to resolving that so called Bad (racist exchange) leads to what happened, then your solution is not only wank but itself a higher order of criminal than the original freaking Bad-exchange that started this (IF it is what happened).