I don't trust Iran either. That's not to say we should never engage with them, but let's be a tad more careful.
If the US had trusted Iran for a long time, there would be diplomatic re4lations and no sanctions.
Iran is a big player in the struggle against ISIS... the Iranian government may be a piece of work, but nowhere near as bad as the pure evil that is ISIS.
Iran has murdered many many people. Many more than ISIS has (granted, ISIS hasn't been around as long). They might not be as pure "evil" as ISIS, but they are certainly playing in the same division.
