For instance, with my opinions, whether I'm okay with it or not directly relies on how it would be implemented into the game systems. I'm against the idea of them being a weapon class in and of themselves because when looked at from a game design point of view, on the most basic mechanical level guns offer nothing new over crossbows. If I can't discuss that and put in the qualifier of "as long as it's a unique weapon within a pre-existing class" then I can't truly say I like the idea.
For others, whether they are or aren't okay with the idea seemingly depends solely on what period of "Medieval" they percieve the Dark Souls universe to be based on. If they can't discuss "here's the period I have in mind" then they can't properly say whether they're okay with the idea or not.
I now understand that this wasn't your meaning (or at least your intentions) with the quote. But you can't deny that those subjects are core to some peoples' involvement with the discussion, and to say something that can be paraphrased as "stop talking about these things" implies that you don't care about their opinions or that opinions on those particular topics are invalid.
Bottom line is, don't look at anything in this thread as an argument or confrontation. People simply want others to understand their own opinions. At least in my eyes, in the short time I've been paying attention to this thread, nobody has really come across as saying "your take on the matter is wrong!" but rather "I disagree with your take on the matter. Here's my take so that we are both aware as to why we disagree." It's a subtle, but important, tonal distinction. I realize you don't want a flame war to erupt, but from what I've seen, nobody's done any flaming. Things may get heated, but I've not felt a sense of true confrontation so far between anybody, so there's no need to get worried about what subjects we happen to be talking about
PS: I'm really, really tired, so I apologize if I phrased or worded something in this psuedo-intellectual mini-essay poorly. If I have, I'm sure we can sort it out later after I've gotten some sleep