Probability of a meteorite strike hitting your "glass house" vs Russia, Pakistan, North Korea, Israel, China, France, India or HidenBiden pushing the button. Guess probability mathematics was an elective in Chemical Engineering, huh? Oh well.Your scientific acumen is as seriously limited as Musk's.
Meteors strike planets, including Mars, every day. One smash into your glass house and your air will all be gone. The amount of material and number of space ships to send all of it to your dream home of Mars is hopelessly beyond our capacity to produce, particularly when so many of our resources are being squandered on Leftist favorites, from subsidizing "Green" crap, to "art" to paying for transgenders to brainwash small children in school.
And just because you elect to remain on Earth, your 'Little Glass house on the Prairie' still ain't safe from meteorites or asteroids:

Asteroid of just THIS size can DESTROY Earth! NASA outs Scary truth on Earth-killer asteroids
How big should an asteroid be to destroy Earth? According to NASA, Earth-killer asteroids do not have to be big.

...plus you still get nukes to contend with, and then there is the predicted eruptions of one or more of the 20 'supervolcanos' due, and the shoddy work of the various bioweapons labs at controlling their little toys. The old saying 'Don’t Put All your Eggs in One Basket' comes to mind, upon which the Svalbard Global Seed Vault seems based...Musk's idea is simply a logical extension of this. If you want to pooh-pooh him, much easier targets are to be had. His Borg implant idea and fascination with AI being one. Hawking electric cars when The Grid is already nearly shot is another. Thinking he can wrest control of Twitter from the commies is yet one more. All these are ripe for failure (or disaster).