This ^^^^^The person committed the crime, not the gun. The argument that the gun is responsible is one that liberals and anti-gunners have tried to use for years.
If I sold a car I knew was unsafe and did not pass that information on the buyer and the issue I knew about was the reason for the accident, I would feel bad about it................I guess, however I would never do that so I can't say for sure.
People have to be responsible for their own actions.
I don't like it when folks that try to put forth a debate where an inanimate object is the issue instead of a humans own choices.