> This was not suicide, or murder-suicide; it was one of the most horrific mass murders in history, in which the guy that did it happened to lose his life in the process.
Even taking intent for granted, to deny suicide in a case like this would be to suppose that the person responsible expected to survive while everyone else died. What could possibly support that conclusion?
He appears to have meant something like “this isn’t just common murder-suicide: it is a particularly heinous version of murder-suicide that I wish there were a stronger word for” but phrased it confusingly.