I don't.
Most of the cops I know were bullies in high school. They enjoy violence and commanding physical authority over other people. The ability to carry and potentially use a gun is a big draw of the profession for them.
Police violence won't be fixed until we stop giving thugs a badge and gun.
The flip side is that it's Civil Service, meaning everything is scored and at the end of the day the hireable pool of applicants is typically 2-5 vetted and certified applicants for a given position, so the official hiring body (typically the township supervisors or council) has very little decision-making power. In my state they're legally required to hire one of the top 3. If a veteran is #1, the hiring body must hire them unless they can find a disqualifying feature in the interview. These requirements vary a lot by state, this is just my anecdotal experience.
Even in the smallest local police forces - the smallest I worked with was 8 officers, mostly part-time, in a borough of ~1,000 households - it would be unheard of not to get some sort of psychiatric or psychological opinion on the candidate.
A dude from my high school, whose father was a SWAT lieutenant, tried to join but was denied. They had interviewed a bunch of his friends, and during the interview he was asked "why do you yell at your girlfriend so much?"
A smaller department, lets say Bakersfield PD, might not be so picky.
Will it lead to a small increase in the number of shot police officers? Probably. I would rather have that than the current situation.
So, no, you're wrong.
I don't believe this is true.
I imagine it depends alot on how the upper management enforces discipline and the attitudes they pass down to subordinate officers
To me, much of the root cause (it's not just black males per se; think of all the dogs shot mostly unnecessarily by police for instance -- https://puppycidedb.com/) is the over-aggressive militarization of the American police force. Which occurred for many reasons, but primarily was due to various moral panics such as the "war on drugs", and the need of our oversized military industry to dispose of excess military equipment. (See Balko's book on this: https://www.amazon.com/Rise-Warrior-Cop-Militarization-Ameri...)
Ultimately, the problem I can see with such policies is that the "war" paradigms too many police departments are obsessed with divide people between The Good Guys and The Enemy. The police force should be about community first (protect and serve etc.). But when the motif is more Good Guys vs. The Enemy, this probably does allow things like racial bias to play an oversized role. And when the motif is more War War War, it probably encourages hair-trigger responses.
In my opinion, American police violence (and we do IMHO have the most over-aggressive culture of any rich world nation I've seen) won't be fixed until this attitude changes. This is less a police officer issue (officers can be trained to any culture) and more of the type of culture encouraged at a legislative level.
An overly aggressive and militarized culture will tend to attract those with a penchant for violence and an excess of testosterone, while those with thug-like attitudes will tend to create an aggressive culture and to advocate for more military equipment/training.