Gimogen.
I'm positive he isn't a Death Eater. I talked to him about it, and I don't think there's anything remotely tempting about the cause to him.
Also. He did send me books to help identify the curse Lewis had on him, guessing that it wasn't exactly legal for me to heal the patient though he didn't ask questions.
He definitely cares about us. And his family probably don't think twice about their tenants as long as they aren't muggleborns.