Some people are cut out for business, some are not.
I encounter individuals on a frequent basis who demonstrate such a lack of business nous and plain street smarts that they should stay away from getting into business on their own account.
They are so ignorant, naïve, and impetuous that they are bound, sooner or later, to come a cropper.
They are so devoid of a little bit of commercial shrewdness that they are, in business terms, an accident waiting to happen.
Trying to advise such individuals is a singularly frustrating exercise.