As previously there is no room for racism, anywhere.
The problem with BLM is they have seemingly taken all interactions between police (authority) and black people as "racist". Well they aren`t so maybe look a bit wider than that. Ask why the interactions are occurring in the first place. George Floyd had a lengthy list of previous and was rightly selected to be questioned/arrested, if his reaction is to be aggressive/confrontational then the situation escalates very quickly. The police involved should be able to show restraint and act appropriately but they are human and have failures as in this case.
When it comes to sport and football we have Kick it Out as a solid anti-racism campaign that works, we don`t need a political movement thrown in the mix because that alienates people.