Earlier quoted context omitted.
I believe this is usually called the "Please think of the children" argument (or women in this case). I imagine the person you are replying to is not a closet rape supporter, but they likely think that allowing every adult member of a population to arm themselves is not the ideal solution. I imagine you disagree with that view, but the way you have expressed yourself is the start of an emotional flame-war, not a disc…
Arguments against guns are almost universally a think of the children argument though.
Guns are dangerous. Yes they can be used for self defense, but they are also dangerous on their own.
I believe that un-regulated guns are more dangerous (to everyone) than the danger of some subset of people being more vulnerable without them.
I'm not advocating for a ban, but heavy regulation about who can buy them, how, what kind of training they need, and verification of safe storage. Just like I'd expect my government to do with other highly dangerous things like explosives, some drugs, and more.