> He, and only he, is responsible for SpaceX. He literally built his rockets in a cave from a pile of scrap.

From what I've seen people mostly don't credit Musk with building SpaceX on his own. What people found admirable is that of the numerous individuals who could've founded a "SpaceX" and had the means to keep the it afloat through the rocky beginnings unavoidable to newcomers in that field, he was one of the few who actually did. The number of people who fit that description can be counted on a single hand because the majority who are that wealthy are too risk averse and prefer to use their resources to pursue things with greater, safer, and/or more immediate profit potential.