TBF there is a lot of confusion caused by everyone elses cops not murdering black people to anything like the same level or with a history of actual involvement in these crimes. In the US - though even there its a majority of cops - you have a lot more cops killing a lot more people.
To make one completely overblown point, in Vallejo (CA), a city of 120000 people,
cops have shot 19 people in the past decade.
In London (UK), a city of seven million people, cops from the Met and City Police have shot eight people in the past decade, five of them as they carried out terrorist attacks against other citizens.
In the entire country there have only been
25 police killings, of all causes, in the past decade. The US has had between 3800 (the number of deaths recorded on Wikipedia) and 10000+.