Because all the smart people are smart enough to see how much of a soul-sucking cluster-fuck politics is. That, and one could argue that if they're put on this earth to live a life of happiness, how could one ever possibly achieve this through a life in politics, knowing what they are getting themselves into?
Ehhh, that's a hand-wringing, self-serving generalization.
"We have the answers. We're just not soulless enough to want to go through (and perhaps change, in the process) the effort to supply them and make them help."
Whether you think so or not, personal incentives motivate people in their careers, salary being one of the biggest and weightiest. I'm not saying there aren't that many personal incentives to a life of politics, but at face value isn't exactly the most attractive career path.
Politics isn't just about being smart, though. It's about being 'charming' (sometimes for better, sometimes for worse), charismatic, a good communicator (notwithstanding the teams of people behind the scenes to help with this).
I get that it's not everyone's desired path (it's certainly not mine), I just think that saying "many of us are smart enough to have the answers, we just choose not to get involved in politics" is perhaps an... underestimation... of the complexity of some of society's problems.
