They were only 'racist riots' in your mind and those like you.
Could I remind you that they were a response to the murder of three little girls by someone of migrant background, which was another example of numerous attacks. This one was so dreadful that it was the final straw for many.
I'm sure your blinkered mentality has no understanding of how an event like this could create such a reaction.
The authorities and their useful idiot friends just shout racist, as if that explains the fear, anger and helplessness people are feeling.
In any demonstration, there is always a fringe of nutters who turn up. That is never more true than for far left protests.
Lumping all these people into a category of 'racist' is simply a tactic. It is used for control by government and to shut down debate by the left. It's predictable and purposefully reductive.