People are protesting because that’s simply untrue.
For each case you can find (if you can find any at all), there are millions - yes, literally millions - of police interactions that don't end that way.
If you interact with the police peacefully, the odds of you experiencing any violence are virtually zero.
Ryan Whitaker (who was white, incidentally), who opened his front door armed with a gun he was legally and constitutionally permitted to have and to use to protect his home and was kneeling to put his gun down when he was killed?
(And, uh, Jacob Blake?)
I mean, yes, I have been pulled over by the police on 101 and not killed, and I once ran a stop sign in Palo Alto and I wasn't killed either, and I went to pay my ticket at the police station and I still wasn't killed then. But that's true in the other direction - I'm sure I have interacted with millions of people throughout my life, and yet if I killed a single one of them without cause, I would rightly be called a murderer. No one would be saying that the risk of encountering me is virtually zero.
(FWIW Breonna Taylor wasn't asleep, not that it justifies her death and Jacob Blake was most definitely resisting - even the super shaky cell phone coverage from a bystander makes that obvious)
More people get struck by lightning every year.