The grownups are happy, because their share of the cake is worth more.
this part isn't even necessarily right.
if your own kids were the ones who ate some bad cake and ended up dying, are you necessarily happier or better off as a result of it?
actually, let me sharpen that a bit:
if your own kids were the ones who ate some bad cake and ended up dying, are you necessarily happier or better off simply b/c you no longer have to give them their inheritance?
edit: no answers from the twisted f*cks.