Guns are regulated. How much regulation, who gets allowed, what types of guns, and if the regulations are being enforced, those are the real questions. This warrant and shooting is a result of a law that wasn’t enforced well, as they had already broken the law once and yet someone sold/gave them guns again.
I did comment that enforcement seemed to be part of the problem here, yes. Do the laws need to be more strict? I doubt that will fix any enforcement, since that’s the failure.