There are hundreds, if not thousands of instances of police brutality, barbarism, impatience and abuse toward citizens recorded on video since the beginnings of the BLM/Breonna Taylor/general police brutality protests in March or April. Both on Twitter and Reddit, there's so many it's difficult to keep track. Most recently, someone was holding a sign (encouraging the public to get out and vote) at a protest. The police tried to take it off him. He refused to yield it, and within seconds, the officer concerned pepper-sprayed him in the face at point-blank range, from barely a couple of inches away. This is nothing but malicious, spiteful barbarism. Totally unnecessary, and not what the police are there for.
A protester in a wheelchair was manhandled by police the other day, the officer grabbing him by the arm, almost yanking it out of its socket, and dragging him and his chair across the sidewalk. For what? He was sitting down in his wheelchair, talking. And how difficult is it to arrest someone in a wheelchair without harming them? You walk around the wheelchair, grab the handles, and wheel it along. Absolutely no need to grab at the disabled person at all.
There are documented cases of the police lying, distorting and bending the truth to make them appear the victims in this. Most recently, police were seen "raiding" homeowners flower beds for rocks and stones. Why would they need to do this, when they have state-issued weaponry? It wouldn't be so that they could photograph the rocks and claim they were attacked, would it?
There's a number of instances recently where the police have executed random sweeps against the public, and have been brutalising and arresting those who have just been passers-by. The motorist who wanted to leave the area, but had tyres slashed and windows smashed by the police. The Uber delivery cyclist who just happened to be cycling past the police truck when it stopped.
When protesters have successfully implemented defence against the police brutality and weaponry, such as the group who used shields to form a Roman-style phalanx to defend themselves, and the police could not penetrate this, the authorities then banned the public from carrying shields. Can't you see what's wrong with this, Tom? Banning defensive tools such that it makes it easier for the police to brutalise their citizens?
Even outwith the protests, examples of casual brutality from the police, and excessive use of firearms resulting in totally unnecessary death or injury to the public are coming in daily.
The rest of the world looks on and thinks; it's only a matter of time before the public, whether left, right, or centrist, will decide they've had enough of this. There's limits.
From the Benny meme you posted - who, exactly, do you claim is "cheering them on"?