Look, it's as simple as this:
If you supported the Superhuman Registration Act and the Initiative when Tony Stark was running things, you should be supporting Norman Osborn without hesitation. In point of fact, you should be CHEERING HIM ON.
Why, you may ask?
Well, has the Registration Act itself changed? No.
Has the need for superhumans to be registered and overseen by the law changed? No.
So, for those of you who supported the Registration, well, nothing's changed. Except the guy on top.
Well, let's compare, shall we?
"Norman Osborn is brining unrepentant criminals into the Initiative! He's going to be in charge of an army of supervillains!"
As opposed to Tony Stark, who was the one who actually brought unrepentant criminals such as Bullseye, Taskmaster, Venom, and Norman Osborn into the mix to begin with. Please try again.
Norman Osborn made a secret pact with a group of powerful criminals!
Right. And Tony and his group of super-secret friends who killed a bunch of Skrulls and kidnapped and shot the Hulk into space are not at all the same kind of thing. Except it is.
Norman Osborn has an agenda and bends and distorts the rules for his own ends!
And so did Tony every time he didn't go after the New Avengers. Or Spider-Man. Or Daredevil. If Tony can make exceptions, so can Norman.
The Initiative is corrupt and will fail because of Norman Osborn!
OK, well, fine, you say. But it doesn't change the fact that Tony is a decent man, and Norman a corrupt one. Well, as far as that is concerned, I'll let Nighthawk speak for me.
Do you understand now? If all it took was one man to turn the Initiative from a "good idea" to a "bad idea", then IT WAS ALWAYS A BAD IDEA. This was the reason commonly brought against Doom and Magneto: sure they could make Earth a paradise; as long as they were alive. After them, it would all fall apart. So making the Initiative and the SHRA dependent on any one man, no matter how noble, meant that it was fatally flawed from its very inception.