Well according to Higurashi people aren't really responsible of what they do in L4+ phase.
Anyway even from a juridic standpoint you can plead insanity and that totally fits Satoko's case.
Of course there are grey areas, but it's very wrong to assume that the justice system doesn't consider those cases.
Come to think about it... Higurashi was also morally questionable... "a friend killed someone, let's help him hide the corpse!"
So I guess I shouldn't really be surprised by Umineko...
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