The reasoning that Any given person can't be successful because of a their previous career... It's quite frankly laughable. Ford Came from a simple family and simple education. Elon musk drop out of college. Hershey goes bankrupt 7 times before he makes to go off things. I actually know an Amish man with a 8th grade education that has a 20 million dollar business Empire.
Then there's that genius that starts a bookstore out of his garage.