The "progressive" notion that anyone who wants to be a police officer should be able to be one. Thus the quality of candidates was lowered by dumbing down the testing, dumbing down the training, dumbing down the physical qualification, mental ability, having no consideration given to size and who might just be the appropriate gender or size who is in uniform patrol. Like just about everything in life, some folks are not not qualified for the job for a lot of good reasons. There are many different and various chores in LE and some folks might be better doing one rather than the other, or not doing any of them.
Defective cops are a result of the defective social engineering that the dumbasses continually demand with the nonsense of DIE; Diversity, Inclusion and Equity. The most important part of that SJW chant is missing....Quality.
There should be a high bar on who should become a police officer. The selection should be narrow, the testing and training hard and ongoing, and the supervision should be close and done by only those who gained promotions because they were quality people.