What happened is absolutely dreadful. It must have been a terrifying experience for those people living in Whitehaven and surrounding areas.
Its obvious that this mans mind had gone, for whatever reason. That does not excuse what he has done in any way, but it sounds like he was not the sort of person to go off on a shooting spree.
It seems a family feud over a will may have been the cause. Being in the same position myself, I can identify the frustration he must have been feeling. Although I hasten to add that I have certainly not contemplated taking action on the other parties involved.
I often say, and this goes to prove, that you do not know when you leave home, what may happen. Thats why I aim to live life to the full, each and every day.