I basically support that view but let's admit it, "personal gain" may have quite different meanings for different people. And it is definitely far from "one size fits all" thing. It may mean different things even for people at the same social level with the same income. Some are looking exclusively for monetary gains (and that's okay if you ask me), even though, as you said, they make up the majority not just around here but everywhere in the world. They don't give a fuck if their actions do or do not change the world. But for some people changing the world is actually the top priority, and you shouldn't discard them as some like Hitler may have really pervert ideas about it and be looking for something nasty and ugly.