C.E. Evans wrote:
I always took it that Skywalker knew that there was a Sith operating somewhere in the Republic, but didn't know (or rather, didn't believe) that it was the Supreme Chancellor of the Republic until Palpatine all but actually told him. One of the things repeated during the prequel was that the Dark Side was hard to see unless it was pretty much smacking you in the face. As powerful with the Force as Skywalker was, he still couldn't divine the truth about Palpatine being Darth Sidious any more than the other Jedi Masters could, IMO.
Yes, because the Force is the only means of figuring things out...
(Sure, this is Skywalker we're talking about and common sense is a nonexistent concept regarding that bloodline, but the point remains.)