Sometimes, a nutter is just a nutter, even when he’s a homicidal nutter.

In the case of Jake Davison, the Plymouth killer who murdered five people, then himself, the indications are that he was a sad, bitter, angry man with a grudge against society in general and women in particular. He didn’t have a girlfriend, and, like every other sad case nowadays, from cannibals to neo-Nazis, he found company and a label online.