Play the Game said:
If someone wants to kill you its usually cause of drugs, money or they're a psychopath.
This is the mindset that seperates those who love guns from those who abhor them. Random violence is so rare most people will never see it. People simply don't try to kill you for no reason (yes, it happens every once in a blue moon, but not enough to where a reasonable person would alter how they live their lives based on the chances of it happening to them). People who get killed typically did SOMETHING wrong (not necessarily morally wrong, but conventionally wrong or reckless, like flashing a roll of hundred dollar bills on the street).
People kill for drugs, money or women (or they just hate their wives that much).
I'm just kicking ideas around, and I'm not committed to any of what I'm about to write here (so let's here some rebuttals):
Guns exist for one reason and one reason only: to kill people. This is why people who are scared of guns intrinsically mistrust people who are into guns. No amount of second amendment filibustering will convince someone scared of guns that it makes sense for YOU to have one with you all the time.
They see a guy with a gun and they think any combination of these three things: Either A) you want to kill someone, or B) you're unhinged somehow - you honestly think that the chances of someone randomly messing with you to the point where you need to take their life are great enough that you actually NEED to keep this deadly instrument with you at all times. C) your lifestyle is such that you could reasonably foresee yourself needing to kill someone (be it in self defense or not).
So when a person who does not like guns meets you and learns you have one on you or in your car all the time, they take a step back. They think, right away, "guns are trouble. This guy having a gun doesn't make me feel MORE safe, it makes me feel LESS safe. I don't know WHY he has it, and I don't care. I just don't want to be around it, or him."
So, to come back to what this means to the OP, with these norms running through a girl's head, I can't blame her for getting uncomfortable and wanting out of the situation. She sees the gun and thinks, "I don't care why he has it, I don't want to be around it. Guns are nothing but trouble."
Really, Obsidian, this sounds like the OPPOSITE of mental instability.