There's nothing false about the distinction between working for someone and being an entrepreneur. They're extremely different. One is financially low risk/low reward and the other high risk/high reward. I don't think it's cowardice to choose to get a full time job, but it definitely is brave to turn down a high salary and start a company, when you don't already have money.
Your examples are of people that want to do other things, more so than being an entrepreneur. Those people obviously should do whatever makes them happy. For the people that want to be entrepreneurs, above those other desires, there's nothing worse than getting a regular job.
The world is full of people who wanted to be entrepreneurs, but got tied down in full time jobs. Some of those people manage to break free, but as a percentage it's probably quite low.
Amen. I've actually read people explicitly state that entrepreneur's are "different" (with a definitely implied better) and that they should only associate with their own kind, or risk being brought down by the "normals."
That shit pisses me off. Einstein and Feynman weren't entrepreneur's, and they did almost infinitely more than most of us will. Sometimes being part of a team in order to achieve something big is better than being your own leader to do some small, unremarkable thing.
While it may not make you feel like a Nietzschean superman, there are compelling reasons to consider finishing your degree and getting a normal job - for example, the chance to work with a large team of experts who know what they are doing, or to have access to world-class infrastructure, or to work in a field that you'd never be able to enter as an entrepreneur (steering Mars rovers, say).
It's fun to take a risk and pursue a dream (even if you don't appear to have any clear product idea), but there are reasons beyond risk avoidance why many people don't choose to go that route.