No, I know they'll throw me under the bus at the drop of a hat. I'll leave them, too, for something better (which can also happen if they become worse). It's just that, while I'm there, I'll try to do what's good for the people around me, even if what they're doing isn't good for me. I'm still aware of what's going on, and I won't take it forever. But if I can fix the boss (or help his manager fix him, or help him fix himself), then sure, I'll try. I'll even try at some risk of my own job (because if it doesn't work, I was going to be out the door anyway).

The rest of what you said I agree with. That's about how I'd handle it.