Michael,
The crimes committed by numismatists are fairly substantial and continue to this day. Is it worse when the criminals are people that have been respected like Sheldon or Breen? The guy who stole the coins recently from the ANA wasn't famous but he caused a lot of damage. An officer of a regional association stated that that theft and the way it was handled have imperiled his ANA membership.
Personally, I have become more fascinated by the crimes or harms (after the laws were changed) people have committed with money. The nickel coinages, the trade dollar, manipulation of the gold and silver ratio. Of course in today's world the debt crisis, mortgage problems, and recession are due to the same impulses to tinker with money for personal gain without producing anything real.