'Twas brillig, and the slithy toves did gyre and gimble in the wabe

IIRC he gave the Mother Racnoss a chance and then drowned her babies afterwards, which I feel is still morally dodgy.

Yeah, I see what you're getting at, but River never synched her diary with that Doctor in the way that she did with the future Doctor, so she had no way of knowing whereabouts in her timeline he was? And that's more of a River's knowledge of the Doctor rather than a Doctor's knowledge of River issue anyways?

A really bald, grey someone with a tiny head? It could be, but reading crazy things into otherwise mundane scenes is half the fun!