It is not a matter of statistics. You can smugly measure water for 10 years and learn nothing about ice. No amount of data on Swiss shootings has any bearing on

It is not a matter of statistics. You can smugly measure water for 10 years and learn nothing about ice. No amount of data on Swiss shootings has any bearing on whether Joe Gun-Controlled will back a gasoline tanker up to a high school basketball stadium. To predict unknown unknowns, you have to do RAND Corporation-style operations research and hypothetical projections. This has been done, and it turns out that mass killing is easy. Really easy. As in, the 9-11 attackers were a bunch of pikers. That's why after 9-11 security for prominent targets shifted to a strange combination of bollards and guard patrols. Metal detectors and gun screening do not affect safety much. Intercepting truck size weapons does. I'm flabbergasted that my comment was voted down and justified by "what matters is the past, not your ridiculous hypotheticals". It reads like the Microsoft buffer overflow manual circa 1998.