>It helps to a point but it still doesn’t stop a teen from taking the weapon their parents obtained legally. Or from someone driving across state lines.

I think pretty much any steps done in the name of security can be described that way. Locking your front door can help to a point but won't guarantee you won't get robbed. All that TSA bullshit at airports helps make it harder to hijack or blow up a plane but it's not impossible. Having a complex unique password can help you not get hacked but it still can happen, etc, etc.

The only blanket stuff that's guaranteed to be effective are pipe-dream ideas that are just impossible in modern american society. Even the most fervent gun-haters who wish we could melt em all down and outlaw them aren't stupid enough to think there's any chance of that happening.

I think the only people who really believe in the plausibility of that kind of scenario are the ones who use their paranoia as justification to oppose every common sense restriction that the majority of the country supports like federalizing standards and making it so states with shitty gun laws aren't the source of weapons in states with tougher gun laws.