The whole reason we have corporations is so that people can accomplish goals that are too big for any one individual to tackle.

If you care only about your own goals, why not work for yourself and bypass the corporate system entirely? It's sorta implicit that someone who's working for a corporation is doing so because they share the goals of that organization yet can't achieve them on their own. (Yeah, I know that's not always the case because some people lack money and don't have the imagination to get it without a paycheck, but you were talking about "healthy, grown up" people here...)