If Musk were proposing mining asteroids, I’d be all for it. Going to Mars? Why?
Check out the beginning of the video - he tells you why.
The climate change bong heads are certain we are killing earth and need to transfer a human population to other planets if humanity is to survive.
Duh! Because, sooner or later, Earth will die, along with any humans still residing there.
Musk proposes a solution, albeit temporary (if Earth is gone, can Mars be far behind?).
If he comes anywhere close to implementing his dream, his paragraph in the history of mankind will be guaranteed (long after most humans alive today have been relegated to footnote status).
He aspires to be the first human to have started the process of humans colonizing extraterrestrial properties!