Not all of the propaganda works all of the time. Two polls show that the American people have rejected two of the Left's beloved causes, gun control and BLM.
Note that the spike in people reporting "a great deal of respect for police" is highest among... liberals (+21) and Millennials (+19). But it's greater among non-white Americans (+14) than among whites (+11, although there's not much ceiling left there).
I still think that BLM had some valid complaints, although it was clear from the beginning that their chosen method of protest was certain to fail. You can't improve relations between a given community and the police by driving that community into lawbreaking confrontations that force the police to arrest them. It's unsurprising that things have turned out this way, except that it's surprising to see the swing so strong in exactly the demographics BLM targeted for its efforts.