Its not even subtle. "Blue lives matter" is a direct response to black lives matter. Black lives matter is a protest against police killing black people. Blue lives matter is Im on the side of police killing black people. Its flagrant. Im honestly shocked to see this imagery plastered everywhere by suburban dipshits. I say without hyperbole these thin blue line flags are the new swastika. They boldly state "I want n*****s dead"
Sure, there were police association stickers, you could get them ostensibly by donating to and supporting supposedly underpaid cops. But the blue line US flag was designed in 2014 to oppose protesters and for white supremacists to self identify.
Even the term “thin blue line” has changed meaning since the 70s when it began to stand for cops keeping quiet to protect each other. There’s a documentary from the 80s about it.