This is often asserted and maybe it is true. It is certainly true for in-the-moment killings.
Off the top of my head, I struggle to think of an example where somebody has planned a murder months in advance and not considered the aftermath at all. Not only that, but there was no actual gain for them and only likely negative consequences.
People blow up their lives all the time. It defies reason.
In this case, if she's guilty as charged, it appears to be a revenge tour.
And IMO she
did plan it out, the toxin is a potent killer in high concentrations, and invisible after 48 hours.
IMO, like many of us (but hopefully for better reasons), EP found a new support structure online -- narc supply, if you will -- SP and his family were pulling away from her so she retaliated.
Had the 4/5 diners gotten sick and stayed home (not unlike the recent hanta virus death) the individual BWs, the different colored plate, the powdered DCs would have died with the victims, at least that's what it appears EP was banking on.
Did she confess? Not with words. Bit her actions--
As soon as they started asking her about ingredients IMO, she knew she was in trouble. Went home to bin the hydrator. And stall, she needed the hospital NOT to test her for the toxin until the 48 hours passed (maybe she didn't realize they could test for liver damage long after).
I think many convicted criminals think of the aftermath, plan for it, but if one detail falls apart, it unravels.
Like airplane mode, they think it'll protect them from being a suspect, but once they become a suspect, that very thing points to their culpability.
JMO