If a significant part of an ethic group is involved in crime the statistic is rather elementary!
Using the Statistica numbers for 2017 there were 457 police related deaths of whites and 223 for blacks.
If you relate that to arrest numbers from the FBI Table 43 for 2017 there were 82 deaths per million arrests of whites and 100 deaths per million arrest for blacks.
Considering that lethal force is linked to serious crime, blacks in 2017 were arrested 5,000 times for murder and whites 4,000 times. So 82 versus 100 isn’t that much different. Cops don’t kill people without a confrontation and arrests are thae reason. for contact.
Deaths per population numbers are meaningless. Both populations have a large majority of law abiding citizens. Out of 200 million whites there were 5.6 million arrests on 2017 and there were 2.2 million arrests for blacks out of a population of 42 million. Many arrests were no doubt the same individual multiple times, but if that weren’t the case the arrest percentages for whites was 2.8% and for blacks 5.2%.
Most law abiding people don’t personally know anyone who has been arrested this year.