It wouldn't be true to say that Lestrade blamed himself. He got plenty of that from Mycroft Holmes, who was, in the Inspector's opinion, the only man in London more insufferable than Sherlock. He'd been catching some shuteye for the first time in three days when that little invitation to disaster had appeared on Sherlock's blog, after all, and he wasn't going to apologize for being human. Particularly not when he'd had the sense – even half-conscious – to correct Mycroft's first over-educated assumption that "The Pool" in question was the one in the Thames.
Too bad they'd still been too late.