In my obviously very much less than completely thorough experience, they're often people with clear goals who want them advanced. They're frustrated with useless innovation, seeing it mainly as resources that could have been used to advance a more worthy goal. They lament the waste of resources and the failures of vision to bring those resource to bear on the proper goals and problems. All the solvable problems that so many smart, driven people and so much money could hardly fail to solve. The lives that could be enabled, the societies that could be changed.
I've known a number of such people. I've seen a series of such pieces over time, no few of which pass through HN.