Back when that was new, some dark part of me imagined a future of mobile gaming where hoards of kids were running amok playing wildly active games with other players that we muggles could not see.

I didn't want to see any kids get hurt (which would probably happen due to the complexities of navigating multiple realities at once--you have to dodge the bullet and the shopping cart), but I really wanted to see Walmart security be overrun by kids who were mostly trying to ignore them. I just like chaos.

Oh; I thought this had to do with schools curtailing or even banning trading Pokemon cards and playing the Pokemon TCG for various reasons, some more arbitrary than others.

Ah, but it was not like zombies! It was actually a very social phenomenon. I played during that summer (2016?) after not thinking about Pokémon for 15+ years. It was "dumb" but it was cool to have a shared mission, however arbitrary, with so many others. Coworkers pooling money to buy lures, strangers on the street recognizing what you were doing and pointing you the right way wishing good luck, massive groups in city parks.

You are correct that respect for private property or business purpose was likely violated by Pokémon Go players. But "zombie" is not a good description.