Yes, however not every case is unjustified and I never take much merit when comparing statistics from vastly different countries or areas of the world regardless if the data supports or doesn't support my beliefs. Every place is culturally different to a degree.
While I do whole heartedly agree there needs to be some sort of police reform, it should be understood that if you
attack an officer, reach for an officers gun, reach for your own gun and/or try to kill a police officer to escape arrest that you may very well get killed yourself.
I didn't read every single one, but a good place to look is here:
http://www.theguardian.com/us-news/ng-interactive/2015/jun/01/the-counted-police-killings-us-database#where you can expand each case to see race and cause of death. The random ones I clicked seemed more or less justified.