Maybe, he didn't know
Maybe Radagast didn't know what Saruman was up to. When Radagast reported to Gandalf that Saruman wanted to see him, Radagast had no clue what Saruman was going to do. Gandalf even said if he noticed something wrong with Radagast he wouldn't have gone, or would have gone more cautiously. So, Radagast was clueless to what Saruman was up to. Spawn of Ungoliant brings up a nice point, how would Radagast be able to get to Fangorn in such a short time. The only possibility I see is use Haldir's elves transporter beam the used in the movie, TTT, to get to Helm's deep in a few hours. "Beam me up Haldir!" Also, who knows, maybe Radagast was helping Thranduil fight his wars.
Not much was said on Alatar and Pallando, only that they went into the East and stirred up cults. Who knows what they did beside that? They could have unintentionally helped fight against Sauron, by stirring up cults they could have dragged people away from joining his army. This is only speculation on my part.
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