Norman owned up to being the Goblin at one point, but has also twisted it a bit and saying that other people have been the Goblin at other points.
Once again, in a world where our current president is seriously accused of being A SEEKRIT MUSLIN TERRIRIST BORN IN AFRICA, in spite of all evidence to contrary, the fact that America would just fall to their knees and suck Norman Osborn's cock, on the basis that he wasn't the ONLY guy who was the Green Goblin, is fundamentally irreconcilable with reality. LOTS of people, INCLUDING those powerful enough to STOP Norman, would STILL have a problem with it.