All of these make very good money depending on where you live. My brother is a sheriff and with overtime, he hit 100k back in November. His hourly rate is pretty similar to a top rate driver. As a teacher, I can top out just under 100k after 15 years with a Masters degree. Trust me, I did the UPS thing and I a much happier teaching and working 8 1/2 month out of the year.
There are exceptions to every rule.
The average police officer salary is around $50,000
The average firefighter salary is around $50,000
The average teacher salary is around $50,000 and who pays for the education?
The average nurse salary is around $70,000 and who pays for the education?
The average UPS driver salary is around $75,000. The highest average salary with no advanced education or training needed.
I believe the UPS driver earns evey penny. Delivering in sub-zero temperatures or 100 degrees with 90% humidity wearing down the body everyday.
It just shows that the career that "helps" people doesn't necessarilry dictate a better paying job.