Honestly gun confiscations is the only way that stopping mass killings and school shootings will ever happen but that's not realistic for obvious reasons.
The problem gun control advocates have is that firearms are so entrenched in American culture that you need radical methods to address the issue. Like no-one actually believes that background checks or an assault weapons ban will stop the next school shooter.
ISIS used trucks to kill people, I assume you want to ban trucks to prevent future mass casualty truck attacks as well
I'm tired of this argument being put fourth so I'm finally going to say something--large trucks require a CDL license and a class that you have to pass in order to use one. Assault rifles require no such training, so if you're going to use that senseless argument, then you should at least advocate for the same requirements to own an assault rifle that exist for driving these sorts of vehicles.
They’ve also had mass knife attacks. Nobody’s calling for knife control. The Boston bombers used a pressure cooker but there’s no crockpot control
Actually, in my country there is a pretty hardcore approach to "knife crime" with measures that do amount to knife control:
https://www.gov.uk/buying-carrying-knivesAlthough obviously this is a cultural thing, and I highly doubt it would be useful to export my country's mindset to America's.
Tbh I think a lot of the priorities of the gun control movement are out of whack, focusing on scary but ultimately rather irrelevant weapons due to their involvement in school shootings. Which are very awful, no doubt, but a lot of the emotional manipulation around the issue is probably unhelpful (compare with rightsists making similar appeals to dead kids in support of anti-muslim laws after Manchester etc).
What would probably be more useful are gun laws that clamp down on the sort of illegal guns that flood inner cities (without simultaneously calling for police state expansion wrt stop and search etc which is quite tricky)