Depends on who you're talking to. A lot of "anti gun" folks aren't "anti gun" at all. I have no problem with responsible gun ownership but to me responsible has a high bar.
If you are a responsible gun owner, then when a deranged lunatic (who up until this moment is a "law abiding citizen) opens fire in a dark and smoky theatre, you are responsible if you open fire. If you hit an innocent patron, you are responsible.
If you have guns, IMO, you are responsible whether you are present or not. You are responsible for those weapons not being stolen and not in any way coming into the hands of unsupervised minors.
There is a post in this thread that puts it very well. Gun ownership is like having an infant child that will never grow up. The owner must always know where the weapon is and who is around it. There are no exceptions and failure to do so should have very steep penalties. I understand and support Second Amendment rights but with strong emphasis on responsibility. There can't be any "Oooops" moments in gun ownership.