"If suddenly we realized that there's pie everywhere, that there's more pie available than we could ever hope to be able to consume"

I thought about it once too. At my university there was a lack of microscopes in the labs,
so students competed for them. I can imagine, if there was an excess amount of microscopes, there would no reason to "fight".

Also i'd like to say that throughout the history of humanity (including now) a lot of people were killed because of money.
As Fresco said once, if there's no money in your wallet, then there's no reason (well, there're less reasons) to kill people.