He's working alone.
He's got a grudge against the government. Maybe he applied for but was rejected as a 2010 Census worker?
He's mad at his ex-wife, too, because she took him back to court for his failure to pay child support. He's pretty sure the kids aren't even his.
He watches crime shows.
But not "COPS."
He dropped out of high school when he was in 10th grade.
He has Internet access, but is only adept at maneuvering the world wide web to seek out porn.
He remembers being awestruck when Timothy McVeigh struck in Oklahoma City.
So he decided to drive down to the city and show them all.
He discovered too late that not all fertilizer is explosive grade.
Obviously, I'm all for remaining vigilant, against both the real bad guys and the losers looking to get lucky.