I think the question is whether there's any evidence these laws have mitigated or prevented anything. After 20 years there should be a vast body of evidence to

I think the question is whether there's any evidence these laws have mitigated or prevented anything. After 20 years there should be a vast body of evidence to justify the second, third, and fourth order effects these pernicious laws have had on society. Rather than looking at the facts, we keep pointing to nonsense perpetuating the existence of a self-licking ice cream cone. It's easier to put your head in the sand and ignore or downplay legitimate grievances when the rules you impose on everyone (and enforced at gunpoint) objectively has zero positive outcomes and a litany of negative outcomes. I'm sure the TSA confiscated a lot of leatherman multi-tools at the airport, but that isn't a benchmark for their success. Take a guess how many terror plots have been foiled by the FBI/DHS/TSA versus random people over the same time span -- or how many caught by random people were already a person of interest by FBI/DHS/TSA.