One, the qualifications for being a politician are essentially at odds with the qualifications for being in the sciences. The latter requires a relatively objective look at things while the former is almost entirely SUBjective, owing to the fact politicians essentially are playing with other people. Essentially, in general, great scientists make poor politicians and vice versa.
Two, it goes to the general population. The average person doesn't want to know this stuff. They just want to get through their day, enjoy themselves afterward, have the occasional day off, and repeat ad nauseum. Worse, any attempt to install an academic or some other meritocratic qualification for being an actual citizen WILL (not may) get corrupted in some way.
Frankly, you have to wonder if the human race really is cut out for this kind of civilization.