There's been a lot of discussion here lately about what we (The US) should do with guns, but not very much about why they hold such a prominent place in our society and culture. Unless you're a holdout from Myth, Gnop!, Minotaur, or, god forbid, Weekend Warrior, you've played and enjoyed a Bungie game with guns in it. Despite this commonality, we have many different feelings about these weapons when it comes to the real world. Why?
I would ask that you watch the video I've linked before posting. It offers one perspective (which is relatively neutral in terms of real-world politics), and I think we'll get a more meaningful discussion if we consider it before presenting our own.
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Your question is "why do we have so many different opinions on guns IRL". There's ALOT of reasons for that, not the least of which, is that everyone has different opinions on pretty much everything. If what you meant to ask was "why are guns such a big part of society", I'd say for the same reason the sword or bow was a big part of society in medieval Europe. Their weapons of war, tools of self-defense, tools of empowerment, tools for hunting and in turn feeding your family, and in the case of guns subject of much debate. Just as tales of the knight in shining armor were glamorized in Europe, so are the story's of a soldier fighting for his country, family, friends, or freedom today. I don't think that it's so much the gun as it is the idea of struggle, conflict, self-empowerment and valor that appeals, guns are just a big part of that today.