The guy who did this was a complete loon. Consumed by hate.
In 1981, he attempted to kidnap the Federal Reserve board (yes, you read that right). He spent six years in prison for that:
"In December 1981, he walked into the Federal Reserve Board's Washington headquarters with weapons and a plan to confront the bank's governors, according to news accounts. ... Carrying a revolver, a hunting knife and a sawed-off shotgun in a satchel, von Brunn raced past a guard to the second floor, where the board was meeting. He pulled the shotgun on another guard in the corridor leading to the boardroom. ... The guard called for help, and von Brunn was overpowered before anyone got hurt. "
James von Brunn: Maryland man held in shooting at Holocaust museum -- baltimoresun.com