This is silly. Entrepreneurs are no more (and not necessarily any less) virtuous than anyone else who works. People have the whole gamut of motivations. In general, humans need something to do-- to keep fed, and to keep their spirits high.
There are plenty of entrepreneurs (even many quite good ones, in terms of effectiveness and moral character) who have the same pedestrian motivations as average people going to work: wealth, security, esteem, et al. Don't put them on a pedestal.
Of course not. They're not driven to selflessly improve the world, they're driven to make a change in the world that has their name on it. In fact, that change often has a negative impact on the world at large.
It's about ego, really.
The problem with Silicon Valley VC is that it has become so superficial. Unemployably good are 4-sigma creatives who tend to come with ADHD, mental health issues, unusual backgrounds and socialization, and (if they spent adolescence in the US) low-grade PTSD. Those are socially limiting. Unemployably bad people are great at making first impressions because their problems are deeper character issues. So guess who gets funded in shallow bubble times?
I've worked directly (as in, same team, interact with them day-in-day-out) with at least half a dozen people who have founded their own companies. Some of them ran these businesses for 5-10 years; a couple even exited for fuck-you money. They are back working at Google, because Google is doing things they can't accomplish working on their own. Oftentimes they make great employees in leadership roles, because they know what it takes to ship product and do it well, and they're well-versed in taking responsibility for their own actions.