The heart of the issue is that ALL LIVES MATTER. ALL of them.
That is just sad.
If you really want to make a difference in the culture of America, try kindness. Try the golden rule. Try bringing those police officers a fresh batch of cookies, or the night shift a casserole for dinner. Hug a policeman if you see them in public. Ask how they are. They are human beings, just like us. They just have one of the scariest, most dangerous jobs on the planet.