it was the testimony of Nailz that was detrimential to the government's case against McMahon.
I remember that. I think he went all batshit crazy on the stand or something like that. Up until he testified, Vince was going to jail.
I don't place 100% of the blame Hogan for the steroid scandal, but he was a huge part of it. Nearly every wrestler was on roids back in the 80's - early 90's so they're all to blame.
Hogan being the face of the company however has to take a large chunk of the blame.