Because you responsibly use them, and no one has stolen them to use them irresponsibly either (and I assume they never could be stolen because I see you as the kind of person who'd keep them in a gun safe).
I'm actually not against gun ownership, and if you look through my posts, you'll see that I've never advocated for banning weapons of any kind (and actually, I don't believe I've involved myself in debate about weapons in general from what I recall). While I believe more could be done to prevent gun violence, I'd say that I'm more moderate in my beliefs about gun ownership. I own two guns myself.
The reason I replied to you was because you compared bicycle-related deaths to gun-related deaths, and compared the cultural attachment to guns with (I assume) a cultural attachment to bicycles, which to me seemed like a strange comparison to make. I merely provided facts and statistics to put the claim into perspective. It has nothing to do with my stance on gun ownership.