The blue lives matter flag is not a sacred object. It doesn't need to be revired like one.
I "laison" with two LGBTQ police officer and one LGBTQ sheriff. One of whom is black and one of whom wears a blue live matter pin. And they all get along just fine as well.
It's possible they would find humor in this themselves. I don't know. I don't assume to speak for them. But having known them and having the sorts of conversations I've had with them, it's likely going to be a good topic to bring up with them.
There you go. There's your pointless reddit screed which no one will read and everyone will scream over.
Ok, if you are pro blue lives matter, which I am pretty sure you are after reading that, then, why would you promote ruining there flag? Disgracing a flag is horrible, and that's what they are doing here, so, why do you promote that?