Can anyone tell me why

Welcome to the world of "what's okay for me to do isn't okay for you to do"....

Black lives only matter when killed by a white cop.

WTF do you blacks have against obeying a cops orders instead of trying to flee or fight the cop when you are confronted?

You're in a lose/lose situation.

Black lives don't seem to matter in the city I live in. They're killing each other every fucking day and don't think nothing of it.

The last time I checked painting is not a crime.

For the same reason that couple in St. Louis are facing charges for defending themselves while the rioters who threatened them walk free, threatening others. The libs have gone rouge and they wish to destroy this country.

I don't know if I can explain it adequately.

Throughout history, segments of society that have been repressed or minimized have erupted violently and loudly when they see a chance to truly change things.

I'm sure it happened earlier, but the first incident that comes to mind is the slave rebellion against Rome led by Spartacus almost 2100 years ago - 71 BC.

That was a lot bloodier than graffiti in public places and it was not a racial movement. Slaves then were often captives taken after one of Rome's many many battles to take new lands.

The lesson we need to learn is that revolts don't stop permanently until change takes place permanently. It's a lesson we (whoever the suppressing class is) ignore at our peril.

BLM is meant to keep "you are doing wrong and you are allowing wrong to be done" ringing in our heads.

Another translation could be "every symbol of your comfort and complacency" is a target, until we too are consistently invited to every privilege and opportunity.

It seems a fair idea to me.

It depends on the reason [b]why[/b] it was painted over. Maybe the person doesn't think that us black people are humans and our lives matter too?

Because murals aren't considered vandalism. They're approved by a city council and mayor. For someone to paint over a mural without the authority to do so is vandalism.

Because black lives do matter and society needs to get that?

If they have a permit to paint it, it's not vandalism. It would depend on the individual case.

No one has commented on statues everywhere being pulled down or broken or vandalized. Isn't that a crime?

What kind of statue is it?

Because the prevailing authorities approve of it.

I agree with you !

Depends whether or not you dislike black people and [b]don’t[/b] think their lives matter. Generally one has to get a permit to paint any type of slogan or mural on any property that isn’t theirs, or consent from city or state leaders. The type of person who would just paint over BLM (assuming it’s not on their property) would be a white supremacist, trying to make a point.