The discrepancy by race in America when it comes to especially criminal justice, but all sorts of walks of life is not an opinion or some anecdotal fuzzy idea. It's statistical fact you can easily look up.

More whites are incarcerated and killed by police...period.

76.5% of the country is white.
13.4% of the country is black.

First line from the study linked above...

Black men constitute 6 percent of the US adult population but are
approximately 35 percent of the prison population and are incarcerated
at a rate six times that of white males

Is this also a power issue between the have's and the have-nots? Sure, it can be that and ALSO overlap with race, which it clearly objectively does.

The argument you're making is that if someone shoots my brother and I go march in the street for justice for him, I'm a hypocrite if I don't also march for your brother who also got shot? If I don't march for him, I'm saying his life doesn't matter? If I made a group to march about all police violence in the US am I a hypocrite for not also making a group to defend police violence against Palestinians? Am I anti-Palestinian for addressing the problems of Americans. You can go on like this forever.

If today is my birthday and I walk into a room and say "Happy Birthday to Me!" Would you jump up and say "ALL BIRTHDAYS SHOULD BE HAPPY!" Would you assume that by me saying Happy Birthday to me, that I'm saying you should have a sad birthday?

The all lives matter talking point is a trick. It's a trick to making the act of addressing the problems of black people into a debate. Into somehow a bad thing. Don't fall for it.