. . . Delahunt’s people have offered one ridiculous excuse after another for his weeklong silence. The congressman, they have said, is traveling in Israel. He was, but it isn’t as though there are no phones there. He doesn’t remember much, they say. Talk to the Braintree police . . . Look, I’ve known Delahunt for years, and I’m not, at this point, reading too much into his actions. But Bishop’s alleged slayings constitute a huge tragedy, and how they happened is a matter of urgent business. There were not just red flags that she was criminally dangerous; there were...