Because I don’t use them as a weapon. I don’t know anyone unless they’re an LEO or in the military that uses their firearm as a weapon. Things have multiple uses, as I have said before.
I use a knife for opening boxes and cutting food. It can also kill someone.
You can consider either those a weapon, that’s fine by me. But I do not use it as one, nor do I plan to, thus I do not classify a firearm as a weapon.