I think a fair way of assessing Sheila's culpability for shooting dead the other four victims is to say the she was two different people, in the first instance she was a young mother struggling to bring up her two young children, often behaving as normal as any other single parent in similar circumstances, but once her psychotic episodes kicked in, she turned into a different kind of human animal. In this second example, she would not be able to recognize anyone in her presence, as being someone she knew, but would become paranoid about everyone trying to kill her. In these instances of psychotic state Ralph would have been trying to kill her. The same applies to June, Sheila would not have known or realized that it was her mother she was shooting at in the bed, Sheila would simply have harboured feelings to want to kill her, or be at peril of being killed herself...
The guilty supporters always seek to portray Sheila as a happy easy going young mother of two little boys, who she loved dearly, etc, etc, but once a psychotic episode kicked in, it is almost certain that she would not have recognised them as her own two children. I agree that the good version of Sheila Caffel would not have been capable of killing her adoptive parents and her own two children, but likewise, once she had become changed into bad herself, There isn't any atrocity that I can think of, that this other Sheila would not, and could not have done...
