That's the danger with putting measures like this in place as a reaction to a shocking event. Once done it's nearly impossible to undo (Patriot Act, NSA Surveillance Act, etc., are more good examples).

It reminds me of Norway's response to the Utoya massacre. IIRC in a speech at the time the gov said they weren't going to change their system because of one terrorist. (I might be remembering wrong but that's what stuck with me.) The US on the other hand took the opportunity to ram through as many "security" provisions through as possible which are with us to this day and can no longer be questioned as to whether they are indeed necessary or helpful.