While this is far better than carrying a gun, there is something seriously wrong wherever this is actually good practical advice for a portion of the population (you are not suggesting that these concerns are imaginary, are you?)
If I had my way, all government bureaucrats would have a body cam glued to their chest, not just law enforcement. Humans are prone to bad behavior if they think they can get away with it.
And do carry a gun. And have a shotgun for home defense. And a long gun for when it's time to water the tree of liberty.
I don't personally think we're their yet because excessive police violence in my mind is simply a result of having a large amount of society that thinks you can pick and choose which human rights apply to whom and when and I think police violence will go away as that gets solved.