I wasn't suggesting that you would believe that Jeremy would arm himself with information on multiple shot suicides, I was using sarcasm to satirise Adam's previous post.
I think the point has been well made by Alias, Patti and myself and you seem unable or unwilling to understand the significance of the point.
Your argument that the call may not have been part of his original plan but something that he added later to "conceal his tracks" is so nonsensical it is beyond belief. Why would he add a call which could do nothing to "conceal his tracks" but in fact would lead the track inevitably to himself. I don't think that you have thought through your reasoning.
If you agree that it had to make sense to Jeremy then I think you need to explain this further. How would it make sense to Jeremy to invent a call which implicated Sheila after he had apparently messed up and made suicide a non option.
Following YOUR chain of thought, I can quite reasonably say that, for ALL your bumptiousness about your "well made point" YOU "seem to be unwilling or unable" to comprehend what Jeremy MAY have done if he found himself in a corner he hadn't expected to be in.
I stand by, and reiterate, what I said about the need to think on the run. It MAY have been his plan to go in, shoot everyone, leave and do NOTHING. He could then have "discovered" the scene when he turned up for work OR have appeared suitably devastated and horrified when notified that someone else had. I can't imagine that having to shoot Sheila twice wouldn't have momentarily thrown him and he may have felt that his priority NOW was to PROVE he wasn't at the scene by informing the police that he'd had a call from his father, who WAS. I never said it was the brightest plan in the world -although he came VERY close to pulling it off.
I can't BELIEVE that you're actually asking me to explain further WHY Jeremy would invent a call to implicate Sheila........................The OBVIOUS answer, surely, is to deflect suspicion from himself. His father, according to Jeremy, had TOLD him Sheila had gone mad and had one of his guns -and here, Jeremy is effectively distancing himself from the situation. He knows nothing more than his father has told him. How could they doubt Jeremy? Jeremy then spent 2/3 hours LABOURING, to the attendant police, the point of his sister's mental illness.
I allow that none of this would be what YOU would do, which could be why it sounds incomprehensible, but I assume you've never slaughtered five members of your family. The person who IS capable of such is likely to have a mind set very different from your own.