The reaction of the media, and hence the public, is like an auto-immune reaction or allergy reaction. Some harmless pollen grains are detected in the bronchia and the body responds as though it is being invaded by the Ebola virus. So even after we deny the ability of terrorists to fly fully fueled planes into buildings, the media reaction for an attempted terrorist attack, no matter how successful, no matter how far fetched, would ensure the terrorists get their oxygen: publicity.
What we really need to prevent terrorist attacks is large doses of anti-histamine. Just ignore the terrorists, their attempts, their successes, their failures. Only when develop the collective ability to deny them publicity we will win the war on terrorism.
Similar thing with the school shooting IMO, I expect that if we stopped having a media circus after each one and turning the shitbags into celebrities we'd see a marked decrease. Instead we just keep making bigger deals and probably inspiring more people to go out in a blaze of "glory".
"If I do not want others to quote me, I do not speak." -- Phil Wayne