There's far easier ways to get rid of them, given they can wipe the memories of archangels - and that alone is what has Raphael convinced they aren't meant to die down here.

"I'd suggest not drawing attention to yourself then." Which would probably work for here, even if he can't vouch that Lucifer will leave Sam alone.

"No, I didn't. Shored him up, more like it." And more than once. "What's happening to Sam isn't a simple fix." And he's was rather pissed off about that. Things which he couldn't heal he took as a direct insult.