You're basically arguing that incidents don't occur when pretty much everyone practicing professionally is licensed. Sounds like the desired end state to me.
I've never heard about any hairdresser related incidents in my third-world homeland either. The professional licensing leads to the same end state as a bear-repelling rock.
I've never heard of an actual bear attack either. But I still know that interacting with wild bears is a potentially dangerous situation. And I will certainly want that bear-repelling rock if there's a bear looking at me with murderous intent.