> I have a hard time understanding both cheating at a marathon and killing yourself over being discovered to have cheated in marathons.

I think, generally, the abuse that's occurring here is that people willfully raised the profile of a perceived wrong. Lobbying the people who run the races or local papers that ran stories about him to correct those things is appropriate. The national media showing up and people trying to bully or harass him crosses over into ethically bankrupt behavior under the guise of "justice".