Decades ago, if you wanted a work-when-you-want lifestyle and no boss, and you didn't know how to start your own business, becoming a cabbie was the obvious career path. And cabbies do occasionally experience unpleasant customers with nobody to turn to for help, so you have to have a thick skin to last in that job.

For whatever reason, in the US the crowd self-selected towards the immigrant population, whereas in many less developed countries it went towards the bare knuckle boxing type of crowd. No wonder that the latter didn't hesitate to use their knuckles on Uber drivers, whereas in the US that rarely ever happened.