Participation in the conversation is completely voluntary so it's completely up to you if you want to respond.
We’ve both read each others points, and found them unconvincing.
You didn't really argue your point though. You said "You're wrong" and "... But what if bad stuff happens?" It's not like we had an actual debate here. Maybe you didn't find the points I made compelling, but at least I tried to explain my reasoning for reaching that position.
but the threadiverse is small and we’re likely to encounter each other again.
Any negative perception I have toward you personally really doesn't have anything to do with the actuall disagreement, but your approach to "discussing" it. "Because guns bad", "don't bother consulting your canned talking points", etc is not a good-faith approach to debate. If you actually care about fostering good relations in a fairly small community where you may run into people again, I'd suggest reexamining your methods.
I’m guessing that our disagreement just comes down to a liberal vs leftist divide
I don't think so. My position and what I'm arguing (although possibly incorrect) is purely based on what I see as the reality of the situation. A belief about whether guns are effective for preserving freedom against the government/fascists/whatever doesn't have anything really to do with politics.
and possibly also American vs European.
Which one of us is supposed to be the American and which one is supposed to be the European?