I Guess This Needs to be Said
I had thought that post-9/11 and with the very visible object lesson of TSA security theater that this would have already been understood, but I will repeat it: There are no security steps that we are willing to tolerate as a free society that would make it impossible, or even substantially more difficult, for a motivated deranged person to shoot up an elementary school.
Promises by politicians up to and including the President to take "steps" to improve safety are illusory. What we will get, if anything, will be incremental steps that will hassle law-abiding citizens (think: taking your shoes off at the airport and not using your iPad during takeoffs) without doing anything to deter actual criminals. In particular, any honest and knowledgeable security person will tell you that there is no realistic way, short perhaps of turning ourselves into North Korea, of stopping a killer who is determined to die as part of his crime.