Bezos Fallcy #1: "This planet is so small, if we want to keep growing as a civilization .."
How does he expect civilization to grow? Do families need to have 5, 7, 15 or 20 children? No other large mammal on this planet has families of that size. For a few centuries, large families were a reality as they needed the labor power to survive, yet most children died before adulthood and most adults died into their 40-50s. Now, medicine, health care and science have extended survival and longevity. We can continue to "grow", as in thrive and progress intellectually and socially without reproducing like rabbits.
Bezoa Fallcy #2: "Using energy as a civilization, most of that needs to be done off-planet".
There is absolutely no shortage of energy on this planet. There's simply a shortage of investment in non-fossil fuel, clean technologies and a serious short-term eziatential, ecological crunch. In real time, solar and wind are as cheap as extractive fuels. In the longer term, there's an infinite supply of geo-thermal and tidal power, and in the long term, fusion is the Holy Grail and a solution for fissoon waste will be delivered. What is lacking is a capacity to store and distribute that on demand over wide distances, so there's local overcapacity everywhere. Further, if we stopped wasting energy overproducing goods to "grow the economy", inflated by artificial demand, there'd be so much surplus, from clothing to food to tech. But that threatens Amazon's raison d' etre.
Bezos Fallacy #3: "They may visit Earth the way you visit Yellowstone National Park"
Here's the thing .. if you visit Yellowstone, you pack yourvtrash back out! If you camp in the woods, you don't pee or crap in your water supply or next to your tent. Yet, we are surrounded by industries who not only do that with impunity, the generally do it legally and for free! Then, the expect otjers to deal woth the problem. So do you! Just toss out that empty pop can that had the deposit 'cos it's only 5/10/25 cents and someone else will pick it up. Ya, well no one is picking up your old clothes, old cars or old tech. Have you read the stories on Amazon's perfectly returns that just go straight to landfills or bur ed ccos it's to much hassle to resell?
North American indigenous cultures have lived sustainably and in harmony with nature for millennia. Asian cultures have thrived for a millennia. Bezos hasn't looked beyond the the Western Industrial revolution and history of colonization (driven by consumption of resources).
Even his vision of factories in NEO is irrational. Where do all the resources come from? Where do the goods go? And the waste? Russia blew up a small satellite amd tjreatens the ISS. That's a couple tons. Haul over a 40 km asteroid to crush it and extract a bit of iron or precious metal, what do you do with the waste? How big a fleet to harvest resources and move things around? That's a lot of space truck drivers!
And let's get real about something .. has Bezos or Musk done any math for how long it would take to have thriving colonies in space or on Mars? Start small, say a colony of 10,000. Is that big enough to be self sustaining? Even the most optimistic guess is 50-100 years, or 1-2x the time we've been "in space", , if you can call a few people at a time, supported by 100,000s directly and millions indirectly on Earth. Imagine what could be achieved for the world's problems ON EARTH if trillions of dollars amd millions of people were thrown at the problems. Within a generation, most of the existential issues will have been addressed and then there'd be no reason to leave the planet.