I have just noticed this thread,which I suppose lies just on the right boundary of acceptability,providing that the posters stick to the medical evidence,whether it be anecdotal or based on a doctor's clinical diagnosis.
With the latter thought in mind I recall Dr. Hugh Ferguson's statement that in his opinion Sheila was not a suicide risk,because she had too much to live for. When told about the murders he was surprised and said that he could possibly have envisaged harm occurring to June but certainly not to Nevill,who was a friend and a stabilizing influence in her life.
Without repeating all the arguments about Sheila,her nails and guns I do find it telling that Sheila had never instigated violence onto anyone else,even whilst in the midst of a full-blown psychotic episode. I still reiterate my belief that schizophrenic patients who are non-violent by nature will not suddenly grab a gun,or a knife which must surely have been available to Sheila whilst she was living with Colin,but not once did she use any violent implement in harming anybody else,but the violence was in frustration directed against herself.