I believe most problems are caused by the government. Osama Bin Laden was trained by the CIA to fight the Russians, the dude who blew up the FBI office with a truck of fertalizer was ex-military, The kid who shot up the colorado movie theatre use to talk to a NSA profiler, Richard Ramirez the night stalker learned some infilitration techniques and knife motions from his cousin who served in vietnam, the united states sold weapons to Iran when relations were good. The NSA, CIA, and FBI all had information to find and kill Bin Laden and avert the twin towers, instead the agencies refused to cooperate and let the attack happen. Meanwhile politicians like Diane Feinstein are after gun owners, TSA is harassing people at airports, and the media likes to scare people.