EDIT: I see my post is being downvoted. I know that it may come across as insensitive to immediately leap to the gun control debate, but frankly I'm more angry than upset by this news. How many times does it have to happen? We have a good 48 hours of emotional outpouring and then everyone forgets it ever happened.
Everyday on HN there's this drone about the next Instagram or 37 Signals. Or who will produce better email or flamewars regarding the next dominant mobile OS. Time wasted, honestly (Oh yeah, 'I figured out project management, again.')
Where's the debate on HN on how best to handle gun control in the U.S. using technology? Can this community not produce answers for those questions?
What about security technology? Maybe if the school had smaller, less expensive and less obtrusive metal detectors? Improved inter classroom comm systems for coordinating lockdowns? Cheap, integrated access systems ensuring only qualified personnel and students access the campus?
On the margin, all these could improve the situation without the need for lofty dreams of a societal paradigm shift or pouring hours into a solution that is already exhibiting diminishing marginal returns.