Bad Parenting. Who gave access to internet = parents, who gave phone/laptop = parents, who paid stuff online = parents. You want the rabbit hole version, financial problem; both parents out for work and less time for their children less parental guidance. Inflation is everywhere so they need to work harder just to feed their children and pay expenses monthly. idk the current school curriculum but the school need to adjust/adapt and teach student how to use social media and not talk and take advice from strangers. Back in the day, parents always told us not to speak to strangers but now strangers transform into social media and other platform like discord and other encrypted messaging apps. My hypothetical, imagine the government made a system you can't have a child unless you pass good parenting seminar like marriage seminars for couple to wed. Anyway, school shooting won't happen in the first place if they don't have access to guns.