how and why in this world filled with all possible available jobs for sustenance will you think begging is the only option for you to make a living??

Hahaha those beggars would ask you the same. Why would you choose to be a doctor out of all the available jobs?
Begging is a profession, at least to them. There are skills to learn in order to be successful in the craft... Trust me, as much as they seem to know nothing, some of them have mastered the art of disguise 🥸.