The following is purely MOO:
The more I think about this case, the more it reminds me of what was called Munchausen Syndrome by Proxy.
en.m.wikipedia.org
Theoretically, if someone was so confident in their perfect crime that if they plan to make themselves a victim too:
1. Feign the same illness; and /or
2. Claim to have made a terrible mistake;
They honestly believe that they will not only get away with murder, but if anyone challenges accuses them, they claim also to be a victim of the tragedy.
It's a very cyncial way for a perpetrator to attempt to disguise their adverse emotional reactions to being challenged.
What does a perpetrator here want?
1. The homicide without penalty;
2. The vindication of their own superiority or struggles;
3. Attention;
*Plenty* of attention:
Woman at centre of Victoria mushroom lunch that left three dead says she feels trapped in her home because reporters are camped outside
www.theguardian.com
Again my opinion only. Something just seems so ... off here.
But please keep an open mind, the same was for Lindy Chamberlain... she was different.
And the trial by media was a gross miscarriage of journalism driving justice.