Dave has provided firearm owners with a good voice. I respect him, although I don't always agree with him. This is one of those times.
Responsibilities? My responsibilities to my fellow men is to honor my contracts and not harm them. Otherwise, "responsibility" sounds suspiciously like an "obligation" thunk up by someone else who wants to control me rather than persuade me.
Except not initiating violence against others, and not endangering them by violating The Four Rules, what other gun-owner responsibility could one have?