Who is he 
The guy responsible for giving bitcoin its worth. Without him, we'd be trading in double digits now.
How do you get to that? He is actually the opposite of what you saying.... without him we would have been trading in quadruple digits by now. The amount of damage Mt Gox caused the reputation of Bitcoin,
is simple enormous. A lot of people got burned in the most early stages of it's adoption phase... some of those people turned against Bitcoin and are spreading FUD all over the place. In almost every media
coverage or content being created about Bitcoin... Mt Gox or Silkroad are mentioned at least once.
While Mt Gox effectively goxxed the world, Silk Road has a pretty interesting effect I think. It brought us some criminals, who have indeed more money that Michelle, 89 years old, and his cat.