They were forbidden to use their full power by the only creatures more powerful than themselves. The Valar trapped them in old mortal bodies to stop them from using their full power. Saruman joined up with Sauron to get close to the One Ring and use its full power for evil. He also seeked dominion over Middle Earth, but Saruman did not see what he was doing as evil, so no one would have assumes he was evil and wanted to rule over Middle Earth as an evil Tyrant. He is a wonderful villain is the sense that he is smart enough to be able to fool the entire Middle Earth like
They were forbidden to use their full power by the only creatures more powerful than themselves. The Valar trapped them in old mortal bodies to stop them from using their full power. Saruman joined up with Sauron to get close to the One Ring and use its full power for evil. He also seeked dominion over Middle Earth, but Saruman did not see what he was doing as evil, so no one would have assumes he was evil and wanted to rule over Middle Earth as an evil Tyrant. He is a wonderful villain is the sense that he is smart enough to be able to fool the entire Middle Earth like