Everyone who thinks they could take a huge number of squirrels should consider what the jaws of a squirrel look like, how they were made for cracking open hard nuts, and what they could do to you if even one had it in its head to really hurt you:
I don’t think I could take more than a couple at a time, even if they weren’t coordinated in any way.
Even if you perfectly solve crashes (doubtful, definitely not something that exists right now), the problems of microplastic pollution from tires and emissions from electricity generation are non-trivial.