You do understand the absurdity of “stamping out” almost entirely peaceful marches and protests against police violence though?
I agree that it probably wasn’t the best time to have them, but if they were going to happen (and given what was happening in the US they were always going to), then they had to be handled with sensibility and tact. They were, in the vast majority of cases.
I should also say that doing what the police did there is entirely in keeping with the principles by which British policing was established back in 1829 - that the police are the public, and the public are the police. There was clear public concern, it was safely expressed, and the demos stopped. Had someone decided to block that concern with force it would have gone wrong in a very real way.