All they had to tell Clint was that the "New" Avengers were Cap's team. Clint idolizes the guy and wishes to honor his memory. Mr. Barton's also never hesitated to give the finger to the establishment either.
> If Ronin is Hawkeye I can't see him being anti-registration. Hawkeye was killed by one of his friends...the Scarlet Witch. A super powerful mutant. She also killed Scott Lang. I just think Clint would become an uber SHIELD agent before a renegade Avenger. (Renegade Avengers coming this fall! it sounds like a good title)
Although I think he would be a perfect fit in the Mighty Avengers as Hawkeye!!!!