I don't know if it's because he's a nice guy. I think you identified the reason earlier. He's avoided direct whistle-blowing because that could get him removed

I don't know if it's because he's a nice guy. I think you identified the reason earlier. He's avoided direct whistle-blowing because that could get him removed from the Intelligence Committee. The only reason the committee hasn't tried to force him out is because he'd talk, and he won't talk so he doesn't get forced out. He'd rather be there and be the bulwark, and occasionally get people to perjure themselves. It's an odd game-theoretic stalemate.