Phineas and Ferb's SECRET Hero!

I recently checked out PHINEAS AND FERB, and it's actually way better than I expected. But one thing stuck out to me above all the show's idiosyncrasies: Why hasn't Dr. Doofenshmirtz been arrested? He's obviously a villain, and his plans are so easy to thwart. Well, Loyal Theorists, I've uncovered the answer: Doofenshmirtz is unwittingly helping the OWCA the whole time!