people charged with the protection of others should not be given slack, or leeway. This is the problem. How would you feel if your life was being guarded by "rookies just getting their feet wet". Not comforting. Put them out beating the street to get some experience.
I'm a welding supervisor. We don't put new bee's out in the field wleding structural steel on high rises, school, etc. They are in the shop, learning, being taught, correct procedure, right, wrong, etc. Not until they have proven themselves with out fault, do they get to go out to the field and put their skills to the test and people lives at risk, should they not perform well.
This should be the same with LE, who's job it is to judge who and what is safe, dangerous, etc.