The most tangible lesson here is about gun control, specifically how vulnerable an unarmed populace is and how foolish it is to think the police can save you. Far fewer kids would have died on that island if it hadn’t been a gun-free leftist utopia. So if we want to count the bodies and assign ideological blame, we can start with the left. Lone kook killers have always been with us and always will be, but choosing to be totally helpless before them is a leftist innovation.
Instead of bringing a knife to a gunfight, these kids were not allowed to bring anything.
A total slaughter.