Because we pay them for that!!!
Yep, that is a good career path. Also, no mandatory retirement date, good job security (hard to outsource those jobs) and the occupation has favorable tax attributes, and every fringe benefit you could imagine.
What you want something to succeed you spend tax dollars to support it, what you want to end, you tax. So we give money to the poor and them wonder why it expands and grows as we tax the wealthy and wonder why their numbers grow fewer. Ask yourself this; does Mexico give aid to their poor citizens? Why does Mexico have as many millionaires as the USA? What do they know that we don’t know? Mexicans are some of the hardest working folks out there.