Context is extremely relevant to the point of ownership.
I own a knife that can be used to kill. But I use it to cut food. Is it a weapon?
I have poison in my home! It's a detergent I use for cleaning. Am I in possession of a weapon? It could be used as such.
OP may have a gun as a deterrent of some sort, despite not planning to ever use it.
Context is everything. And stating otherwise is - frankly - bullshit.
Want != may need | so thats a logic fail
Viz, police, armed forces, etc.
Safety-factor is a principle of engineering. The folks that do stupid shit for "sport" do so in every walk of life, with every set of tools. Viz, black-hat...hacking, etc.
No, I do not WANT to kill anyone. I hope I never have to kill anyone. To imply that I sit here now desiring harm against some unknown person since I own a weapon is absurd.
That's like saying I want my house to burn because I have a smokey detector. After all, why would I want to detect smoke unless I wanted smoke to detect?
Owning a weapon whose expressed reason for creation is the ability to use deadly force against those that you believe might harm you is the reason you own said weapon. Hence you want the ability to kill, injure or maim someone if you feel threatened.
That is the point of a weapon (hence the term weapon). If you own one - you do want to kill someone with it - context is irrelevant to the purpose of ownership (namely specialised directed use of lethal force).
Stating otherwise is - frankly - bullshit.