It's the media encouraging it. If it didn't make headlines for weeks. No one would even think to do these acts.
Look at columbine. Those kids wrote about how famous they were going to be, and how movies would be made about them. Sickening.
"If you remember nothing else about what Iím about to consider here, remember this: the one and only reason politicians, bureaucrats, and policemen want to take your weapons away from you is so that they can do things to you that they couldnít do if you still had your weapons."ó L. Neil Smith