From smokinggun:

FEBRUARY 18--The man suspected of intentionally crashing an airplane into a Texas office building today appears to have posted a lengthy online diatribe attacking the Internal Revenue Service and declaring that, "I know I'm hardly the first one to decide I have had all I can stand."

Read the suicide note here: http://www.thesmokinggun.com/archive/years/2010/0218102stack1.html#theLink

The suicide note is six pages long, but it's very eye opening. This guy realized what few of us statist apologists do.