It ain't rocket science, and certainly doesn't require $100,000 salaries. Although that's about what an average Portland cop makes thanks to massive PLANNED overtime pay and the most ridiculously extravagant retirement package on Earth. On top of that, their time is wasted and their results eliminated by felonious politicians who order them to abet criminals by hiding them from Federal authorities.
Cops salaries should top out in the $50k-$60k range. They should not work any OT at all except in an extremely rare emergency.
Cops hassle innocent people hoping to stumble on a minor infraction or otherwise safe to deal with victimless crime, and they occasionally do some follow-up documentation at crime scenes. The rate at which they save people's lives is lower than that of the average citizen, mostly because police are usually not present when crimes are committed. Most criminals commit their crimes and are long gone before police ever even hear about it. That's just how it is. They'll never be more than the cleanup crew.
If it takes you 4 f'ing years to learn how to taze methheads, write tickets, and lie about the supposed reason you pulled an innocent driver over, you're probably too dumb for cop material. And I doubt any professor is equipped to teach students how to deal with methheads, murderers and mental cases. An area nearly all cops could use education is in the operation of their firearms. Most cops are lousy shots, especially in a real firefight. They are given rapid-fire weapons without being taught how to hit a target with a single shot. The norm in a shooting with a suspect is each cop involved will spray a dozen or more bullets and maybe wing the suspect, or hit him a couple times. The rest of the bullets go elsewhere, needlessly endangering others.
And, in general, very few careers in life require more than a few months to learn the basics unless you're mentally lazy, or wasting your time with unneeded and virtually useless peripheral courses required for a worthless degree. The internet has made the idea of physical learning institutions almost archaic, and I expect them to rapidly fade away over the next 2-3 decades.