I really don't see what's so alarming about that? There was another gun upstairs where it wouldn't of been left, maybe Sheila was running amok with that one to and couldn't load it? Once shot whoever had the gun had the advantage be it a schizophrenic weighing 8 stone or a 20 stone man.
Yes, exactly.
Regarding the gun roch, I just don't see why jb would have even mentioned the gun if he had done it. I mean he could have just said his dad had called and said she got hold of one of the guns as per, he didn't need to mention that he'd left one out. Doesn't make sense to me. It was a farm with plenty of guns around. If he planned it surely he would have asked himself ' what will the think if I say I was outside shooting rabbits and left the loaded gun in the kitchen'
Well he is supposed to have done this to 'set the scene' - as if to say he inadvertently provided Sheila with the opportunity to go on the killing spree. He then apparently didn't express remorse about his 'unforeseen error' (although I recently read a transcript on here where he does - perhaps he then didn't go on to repeat any similar sentiments afterwards).
I suppose you could look at it both ways. The way you have expressed above and the way some people think it was scene-setting.
I tried to find a middle way - which was that he had foresight of her intentions... and aided her by finding an excuse to leave out a loaded weapon for her.