(FWIW, The Guardian, at https://www.theguardian.com/us-news/ng-interactive/2015/jun/... , lists 1146 people killed by police in 2015, of which 306 were black. Almost identical percentages, and it doesn't change your point.)

The tricky part is to look at how non-black people were treated in similar situations. If use of force would have been justified against white people, but non-lethal means were used instead, then it wouldn't show up in the resources you consulted.