The vast majority of cops are good, but it isn't just the quality of the cops, it is the quality of the departments that employ them and the leadership therein.
That is why the "blue line" flags and "back the blue" virtue signaling bothers me... one doesn't have to believe in defunding the police in order to believe that there are a lot of poorly run police departments out there that need reforming. Especially in a country the size of ours. Uvalde is one example, but there are others as well.
But alas, it's "back the blue no matter who!" with a lot of folks.