What must be done to prevent anything like this from happening again?

My two cents? Stop making such a big deal out of it.

These things happen because someone wants the country as a whole to freak out. They want their names to ring out as martyrs to a cause. But no one cares about martyrs they've never heard of. I remember after the shooting at that community college in Washington, the local police chief refused to release the name of the shooter, saying in essence that publicity was exactly what he wanted. Of course the media found out and reported the hell out of it anyway. But I firmly believe the police chief was right. We should turn our backs on these people, not put them up on a pedestal.

But, this kind of self-restraint is apparently far too difficult for us. So instead we'll blame Islam (or Abrahamic religions generally) or guns, and suggest that maybe someone's constitutional rights should be denied because of whom they associate with. After all, we've seen time after time how giving more power to the government and blaming some minority or other has led to greater stability for all.