I think you're right in what you're saying but not what I think you're implying. The solution to one problem is mental health regulations, the solution to the other is improper use regulations. Which are different, but fall under the same umbrella.

Either way, taking about cars is exactly where I'd take the comparison because it's the only other commonly owned (highly effective) weapon in the us. We require a license to use one and liability insurance to own one, then take that license away if you show that you can't use it properly. That's exactly what if like to see happen to guns.