Saruman: [talking to Gandalf] “Your love of the halfings’ leaf has clearly slowed your mind.” — Lord of the Rings: The Fellowship of the Ring
Saruman: [talking about Radagast] “It is his excessive consumption of mushrooms, that have addled his brain and yellowed his teeth!” — The Hobbit: An Unexpected Journey
Of course, Radagast cared for the land and ministered to defenseless animals. Gandalf gave his all to protect the people, including the littlest of folk on the fringes of society.
And Saruman, who cultivated political power, was too easily seduced by evil incarnate.