These things do need clever people to work on them. And yes, there are better people out there. But those better people are not working in droves to solve public issues. If you think there's an army of genetic engineers working on food shortage in an effort just to feed more people, you're crazy. The ones working in the field are working for private companies for profit so they can make a buck, not to help less fortunate people.
At not-for-profits there's usually a person who has the drive to help people, and has studied some particular way of solving a problem and will use the same hammer for every single nail they face. They are not applying creativity, they are applying the one rigorous discipline they learned.
My brother works on social issues for latin americans, for example. He is not a genius, he does not have a PhD. But he is trying to solve real, multifaceted problems that people have with the only skills he has available - communications skills. He is only interested in attacking problems from one angle. But that may not be the best way to approach it.
This isn't an isolated example. I lived in DC and worked with volunteers who would all study essentially one thing ad-nauseum. The idea of going outside their field was preposterous because they had no idea how to go about it.
You should also consider that my definition of hacker has nothing to do with software development. Most software developers I know have got jack shit in the way of a hacker mentality.