I didn't say no one questioned 'things', I said that no one questioned the fact that a mother with mental illness might have killed her own children. Are you honestly suggesting that because there weren't stories of mothers with mental illness killing their children all over the papers the idea could not have occurred to him?
What leap? It may be an abridged version, but that is exactly what he was convicted of doing.
Don't try to deflect the argument with trajectory theories, I'm still waiting for you to tell me why the trajectories preclude Sheila having been murdered 
I haven't deflected anything, it was you who mentioned the second shot

How do you know that nobody questioned how or why a mother killed her own children? You cannot possibly know that. I'm certain that up to 1985, this would have been a massively rare occurrence in comparison to modern Britain. This rarity could have influenced anything, from press speculation to relatives' suspicion.
I simply do not believe that Jeremy Bamber thought
'yes, I can kill my nephews and blame it on Sheila... that will work and everyone will believe it because she is a nutter'. Erm... Bullshit.
What do you make of the other plan he came up with?
I'll kill everyone but tip my girlfriend off beforehand. That will be fine, she won't say anything.Not only does he predict years in to the future that mentally unstable mothers have the propensity to kill their children, he is at the same time so mind numbingly stupid as to almost guarantee a prison sentence, by telling his trainee primary school teacher girlfriend that the twins will be killed.