Of course, the statistics that would reveal whether or not this is down to

[Peter]

institutionalised racism would be those that tell us whether or not black people are disproportionately likely to respond to police questioning with belligerence and aggression.

https://www.theguardian.com/uk-news/...f-black-people

Might also be useful to see what percentage of those arrested in each ethnic group suffered use of force. It might turn out that police are actually less likely to use force against a black person; they are just more likely to nick them and therefore they account for more incidents. A very different issue.