Still believing there is no clear answer to this except for each individual to decide for themselves...I thought of this question I hope the OP doesn't mind an hope not to make anyone upset,
I have a question, for myself, an perhaps some would like to think about this....sure some vets took guns, an some didn't...but what if we knew the story of the weapon, that had killed the American, sure its a tool in wartime, sure its the person an not the gun....now lets say that this weapon was the tool, that had killed your dad....?....or your best friend......you find out, an its placed in your hands...not someone else's dad that you didn't know...yours...what if you had it...?
Would it be cool to have? Would you put it beside his picture an medals? Would you take a hammer an destroy it....remember, this was your dad...would it make a difference? I can't help but think that it would for me......
So, I guess you don't believe that a gun is just a tool.
Let's say that you had the gun that killed someone close to you. As you hold it, do you think that the gun aimed, and fired itself. Do you really look at it and think to yourself. "I hold you responsible". Maybe some people do but it just doesn't make sense to me.
Everyone is of course free to think what they will, but how far can one go with this line of reasoning? When I hit my thumb with a hammer, is it really the hammers fault. (and if it was, how long had it been planning it. )