It's okay to have an opinion. It makes you look bad, however, to defend one guy when so many others who are vilified did exactly what he did. Either the use of HGH to aid performance as a ballplayer (whether by helping to recover from injuries or something else) is okay across the board or it's not. Believing that Ankiel is somehow different from the rest of the HGH users strikes me as an opinion that is based solely on the fact that Ankiel plays for your favorite team.
It's okay to have an opinion, but having one that's not very well defenisble opens you up to valid criticisms, I think.