First off, I would like to say that it was never my intent to spin the preferences of people who don't like guns in a negative light. My point was simply that "suspension of disbelief" is often more related to what people find cool or familiar than it is based on logic.My quote you used actually said I might find gunpowder a greater suspension of disbelief which contradicts your statement right there. In context, it would mean I could find it a greater suspension than magic which certainly varies more greatly from reality than gunpowder by any assessment.
I suppose you could conduct a survey to see if you are right but you seem to be presuming a great deal.
Per point #1, a more neutral way might be to say many fantasy fans prefer a different, gunless aesthetic. I've said that clearly myself as have others on this thread so if you rephrase to avoid the somewhat perjorative "comfort zone" no arguments there.
Per point #2, I couldn't speak for the "many" but as an engineer and an amateur military history buff, I feel I have a reasonable understanding of the capability of gunpowder.
Let's look at a World of Warcraft as an example. World of Warcraft's world of Azeroth is currently one of the most popular fantasy settings in the world, and it contains guns. Moreover, it doesn't just include gunpowder, it has steam-powered flying machines armed with machine guns and bombs. However, it also still has traditional Edwardian fantasy castles and fortresses. There is no attempt at all made to build on the logical consequences of gunpowder in particular or the other forms of crazy steampunk technology in the setting in general. Yet, fans of the game and the setting don't seem to mind this.
I think the disconnect between fans of settings like Azeroth and fantasy fans who can't accept guns at all can only be explained by differences in taste brought about by the differences in what pieces of fiction they have experienced and enjoyed. That is what I was trying to get at earlier. In my case, I grew up playing videogames, and the first console RPG I ever played included a space-ship that took you to the moon, dwarven tanks, and a giant doomsday robot. I think that makes me more inclined to enjoy stranger forms of fantasy.