In the Doctor's defence, he tends to be very idealistic in that he will do whatever it takes to put things to rights, as they should be, particularly if he feels history is at stake here. I get the impression that he gets very caught up in whatever he's doing and doesn't think about the consequences

This got me to thinking (dangerous, that). Was Nine that way? The first thing that sprang to mind was World War Three, locked away in that room. The Doctor knew that there was always a way out, but he was trying to find another option. That to me is someone who obviously was thinking about the consequences of his actions (and non-actions). Second thing to come to mind is sending Rose away in PotW of course, but I was trying to remember earlier events (and ones that weren't quite so strikingly life or death).

So can anyone else think of a time that Nine endangered Rose so foolishly?

I DID expect him to then go, "OH SHIT, ROSE! (and Mickey! yeah not really)" and smack his forehead, and I was annoyed when that didn't happen.

Yeah. He was more concerned for himself, if you ask me. And maybe Rose and Mickey would have been fine, but the subtext did not indicate such.