The hard part is life support systems and not so much the rockets. Musk handwaves and claims life support is easy, both on Mars and in the spacecraft t/fro. The song reveals it's not so easy to keep humans healthy and well, even on this earth where humans evolved to survive.
Musk constantly fails in his claims. His cult like following demonstrates Festinger's When Phrophecy Fails. Failed prophecy which, counter to intuition, strengthens the cult's belief in their leader. It's an illness and not something to promote by my judgment. I think us selecting leaders and peers that work from a basis of reality is they way to improve things. See the world as it is.
" the team had seen that in some cases the failure of a prophecy, rather than causing a rejection of the original belief system, could lead believers to increase their personal commitment, and also increase their efforts to recruit others into the belief"