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Lets see: People do first aid all the time. Camp coordinators are great at first aid.
So why are emergency wards full of doctors?
The same thing with lawyers. You can understand the constitution to a point, but training would give you an edge where being untrained would not.
The president's primary job is as a legal figure. He vetoes legislation and signs legal documents for the entire country.
Of course if you are a retard, you might take this as being all about sneering at the working class, but that is because you are a anti-intellectual retard who is likely to take a science fiction author's novel before the IPCC on climate change.