After all, for all people knew, Sam Brooklyn was a man living a comfortable single-dad life of early retirement in Boulder City, Nevada, and only helping the older ladies of the neighborhood with their gardens for some extra cash. Which, in a way, wasn't all that far from the truth since Aaron had had to give up his degree in law, not being allowed anywhere near a job even remotely related to the government or law enforcement. But, considering that was all Aaron had ever done in his life - it was pretty much all he even knew how to do -, when he was given his new identity as Sam Brooklyn, he decided not to pursue a new career. He wasn't all that young anymore and, deep down, he still had that hope that, maybe, his time away would be short.
Besides, in the witness protection program, the government did help Aaron pay for most of the stuff that he and his son needed and, considering how much he had actually done for them, it was fair that he would indulge now on the help that they offered him now, right?
So, yes... Maybe, for someone on the outside, Sam Brooklyn looked like a man wasting away his potential, but Aaron Hotchner didn't, and, as long as Jack was happy, he didn't particularly care.
Disclaimer: some of the characters aren't mine. All rights go to their rightful owners.