| > How come Norman Osborn became so popular since he was prooved to be the Green Goblin in the first issues of The Pulse and MKSM, and he killed a woman journalist ?|
> Or did I miss something with Norman cleaning his reputation ?
#110 (the first issue featuring Norman Osborn and his new team), he mentions to reporters in a press conference that despite some troubles in his past, Tony Stark had offered him a chance at redemption. As for the murders he committed that became public knowledge, it can only be assumed that he bought some seriously high-class lawyers to get him officially pardoned (i.e. setting someone else up as having framed him, or having the police offically classify Terry Kidder's murder as death by suicide or a random drowning incident, or whatever).
Since then he's become popular due to the Thunderbolts keeping a good face in public, so as the leader of the team he automatically gains credit for that. Secret Invasion
is where things really take a turn for the better for Osborn, as he fights for his country and the President in front of live cameras. The media eats it up, and there we go. Norman Osborn cleared of any wrongdoing in the past and celebrated as a hero.