I thought the issue was that you want Amazon to be on the hook for damages, not that they didn't do enough vetting? You can do all the vetting you want, but people still can crash into kids.
>I mean, look, you have to put all these caveats on your hypothetical. I can't hire a taxi, because then the taxi company would be liable. I can't Uber, because that's a whole mess of who's liable. Etc.
If you're trying to imply nobody gets rides from craigslist and therefore we don't need to worry about this edge case, limos (think for weddings and stuff) are frequently by 1-2 man operations.