Sure but you said it's like other jobs
I think his context was with re: to there being people who are bad at their job.
Obviously, when you consider the power that is given to a police officer the tools/weapons he has at their disposal to perform the job and what the consequences could result from someone not being good at their job...it is unlike any other job out there.
However, when you look at it from the perspective of "some people get hired that just turn out to not be very good their job," it is like other jobs.