I wonder who was "the guy manning the booth." The mask wearing anarchist or the suit wearing business man. Depending on who you met, you will get different answers to your questions, as their personality is the exact opposite. zkSNACKs is a company with over 30+ people already and opinions on blacklisting varies to a great degree from "this should'd been done long time ago" to "we must start working on decentralized coordination protocols." My take is that I'd not like to discriminate between users at all, but it had to be done, and I can only hope it wasn't already too late. At least Bitcoin privacy can flourish.
I'm sorry it has taken me a while to respond, I have been out of town since the conference. I did not ask the man for his name, but he definitely was not wearing a mask (medical nor anarchist), and I believe he was not wearing a suit either, could be wrong as I was very busy for my overly brief 5 hours or so there.
I can certainly imagine that in a company of 30+ employees that opinions on a topic like this would be all over the map.
Privacy and trust-in-privacy are extremely important to guys like me. It pains me that there are so few tools that beginners, and, well, everyone can easily use to keep their financial activities private. It looks like most of us do not want anything like what you are considering as it seems arbitrary. Also, why did it have to be done (my emphasis in your reply)?