It seems to me that you dont know the actual intention of "black lives matter", as well as the phrase "blue lives matter".

"Black lives matter" is in reference of the ongoing injustice of systemic violence and heavy (violent) policing targetting black people.

"Blue lives matter" came up after the horrible violence of cops against black people protesting in wake or George Floyd's murder. It is usually uttered by "law-and-order" fascists.

Therefore:

1. Stating the connection of the post to BLM in the context of "yOuR jUsT aS bAd aS tHe racIsTs!" is simply cringe.
2. Fascists refer to cops they look up to "blue lives". It is ok and your duty as a freedom loving person to punch fascists. That's the point of the original post.

Why do you think calling for violence against the police is a bad thing? Is it bad, in your opinion, to call for violence against any group, regardless of what that group is?

Say for the sake of example that we were living in Nazi Germany. Would you say that calling for violence against the SS is as bad as calling for violence against Jews? I don't think you would.

Granted, we are not in Nazi Germany. The police in America are not the SS. But there are plenty of legitimate problems with the police, including the murder of unarmed minorities going unpunished.

Correct me if I'm wrong, but I suspect you don't believe that the police are bad enough to warrant calls for violence, and maybe that's true. However, there are people who don't think that's true -- they think the police, as an institution, are corrupt enough that they should see violent consequences.

Bit a side note, but I don't know that I agree with calling for violence against the police. I don't think it's going to accomplish anything at this point because of the very real risk of extreme backlash. But I do understand why people want to.