A repeating theme from interviews of people who knew Joseph Stack is surprise that he could have flown his plane into the Austin, TX IRS building.
IRS worker killed in crash was family man – Washington Times.
The above article ( Washington Times checks details pretty well) provides info about the other person killed in the crash, 68 year old Vernon Hunter. Hunter’s son felt a need to speak publicly about him, in response to comments labeling the suicide pilot as an anti-IRS hero.
There is also an expression from Stack’s daughter from his first marriage, that the suicide note seems to be written by another person; that it is unlike her father. there is further information contradicting the previous suggestion that Stack’s second wife and daughter had to be rescued from the burning home. They had, instead, been staying at a hotel, for reasons not given.