The Court appears to see the pitfall of defining a new law for all, based on the actions of a few bad guys. Say 99.99% do not require this law, due to being good citizens, why impose the law on all these people, for whom it does not apply? I do not own guns, but that law assumed I was a criminal need this warning. What did I do to deserve that?
It would be better to deal harshly with just the 0.01% crooks who screw up. Leave the good citizens alone. We can tie the bad guy to a target, and use his modified gun and empty the clip on the target. Let that be a warning to the crooks. The problem is the Left coddles criminals, and would prefer make the honest 99.99%, victims of a law, that does not apply to them, so the crook does not stand out as the bad guy. Serial killers become folk heroes, while their victims are forgotten. Does this create these monsters?
Lawyers donate the majority of their campaign donations to Democrats, who in turn make more and more laws for lawyer jobs. Republican prefer fewer laws but with teeth. Savaging otherwise good citizens, with laws that may not apply to them, adds more lawyer jobs, plus it helps to shelter the career criminals, who can become more anonymous in the 100% criminal world where one size law fits all.
In places where guns are illegal and good citizens follow the law, there are more victims, compared to where guns are legal and criminals think twice since potential victims are packing heat. That law benefitted the crooks, by defining everyone as a potential crook and thereby diluting the limited police that address the real crooks. An honest collector is target taking away police from the bad guys.