I sort of agree with it based on what I think the reason of mass-shooting is. It's beliefs that result in hatred. Guns are only a tool. Gun control cannot get rid of the hatred, merely suppresses the symptom, but is not able to resolve the underlying essential issues.
○Long time ago, when I was in China, my friend told me that people went to their office with guns, demanding repayment of debt. So, no matter it's legal or not, some can always get it.
-sailor(Ocean & Mountain);
○Yes. Just like you said, if people want to kill others, they can do it even though they don't have guns.