He was unjustly killed, yes. Resisting arrest isn't justification to kill anyone, yes. No, I can't admit that the cops are fully at fault because...they aren't. They are only partly at fault because the murder wouldn't have occurred had dude not been resisting. That's simply a fact, bro. Yes, he was pinned down and executed. I am not a white supremacist. And no, him resisting arrest is a legitimate excuse to blame him IN PART for his own murder.
Just like if a woman decides to dress up in a tight skirt and a tight shirt and then drink alcohol until she can't stand/think and blacks out. If this woman gets raped, am I "blaming the victim" by telling her that she is at least partly responsible for getting raped? No, I am not, because had she not made the choices that she made, she likely would not have been raped.