Because in all those professions, there is enough time to follow a process, or (in the case of pilots) their survival is linked to the survival of everyone else.

In a typical police apprehension, there may be a second or less to draw your weapon and fire. Nobody would take the job if they had to be perfect or lose their freedom or life savings.

Speaking of life savings, most of the criminals they apprehend have nothing to lose. So maybe you're on to something. Let's hire police who are currently incarcerated and have no assets, family or wealth to lose. Then they can be subject to the draconian measures of your fantasy and worst case is they got a few months of freedom. Smart guy you are:)