Because the media gets all up in their private lives and they take a lot of crap for nothing, so most normal people won't do the job.
Discussion
also normal people are busy doing normal things like…actually working and building shit
You may not be aware of this, but most politicians work a job in addition to being a politician. They're usually only part-time positions and they pay peanuts or nothing at all.
Almost all politicians are someone sitting on municipal water rights management board, heading up the regional homeschooling association, running the traffic planning commission, or something.
The responses you're going to see in reply to me are the explanation why the quality of politicians is so low.
Nobody wants to listen to this shit all day and have tomatoes thrown at them in the street.
Lots of people turning down office and others only accept if they get literally begged into it.
And of you're a woman in office, the sexual harrassment is constant.