Had old Joe stayed with the intent of his speech instead of wandering into details he doesn't understand, he would have been fine. He's correct about the need for police to be better trained, and have more situational sensitivity. They are mostly trained on how to project authority because there's a belief that's what is required in most situations.
There's a belief in a lot of professions that being professional means being stern, matter of fact, and unemotional. I reject that notion. I'm a consultant, and often interact with C level people at my clients, especially CIO's and CFO's. Technology people and Accounting / Finance people. I'm happy by nature, and don't find projecting that happiness to others. I've learned that it puts them at ease. I can be very direct with my comments, because the people are at ease.
Every now and then we'll see a video of a cop who has a sense of humor interacting with someone, perhaps writing a ticket. The person getting the ticket appreciates the cop, even as they are getting a ticket. We see that video, and every single person smiles and says, "Yeah! That's awesome! That's how it should be done!".
But why isn't that the norm?
A lot of people believe authority has to be established early in an interaction. Perhaps, but that doesn't have to happen by being a jerk. It can happen by simply being confident.
Oh... Joe is mistaken. If you are going to shoot someone, it needs to be at body mass. A firearm is a very efficient tool, and should be used as such. If there's time, there are other, non-lethal tools that can be used.