Spoke to my wife (a shrink who deals with some of these types) about it. Obviously not a huge amount is known about this guy but made a pretty interesting point - don’t ignore the way it was done. The way they kill themselves/others is usually telling.Absolutely horrific and unforgivable act.
It sounds like he had some deeper issues that were never (or unsuccessfully) treated.
We can’t bring the family back but what lessons can be learnt from this atrocity?
The rage and contempt he was feeling was probably at a level that is almost unimaginable to your average Joe so he was probably a raging narcissist, a term that gets bandied about a lot these days but isn’t always that well understood.
If that’s the case, he’s one of a class of people which is the least likely to seek help and the least likely to benefit from it anyway. Admitting any failing is impossible, and his deep seated problems would have started when he was young.
It’s not a matter of other men ‘calling out’ his behaviour. Best you can do is get the wife away and lock him up if he tries anything.