One aspect of policing in America that your post doesn't capture is that a lot of police aren't paid well. Generally, police in large forces in large cities are paid well, but there's an indredibly wide variance that trends steadily downward the further you get from top-tier cities. Rural cops are often paid less than teachers; even in cities like Columbus, OH, or Milwaukee, WI, it's common to see police moonlighting as security guards.

Like teaching, there's always a lot of rhetoric around how police are valued, but pay scales frequently don't reflect it, and the result is a lot of poorly qualified police who fail the rest of your checklist