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I always hate when people excuse Sayo of everything related to the murders by using what happened in Prime to say that she wouldn't have murdered, that she was full innocent and unable to do such a thing.
Although EP7 explains very well and explicitly that the only reason she didn't do it was because the adults solved the epitaph, and for Sayo that meant losing, Beatrice's death. She gave up all possibilities and left her future to fate. She was definitely going to start the murders had the adults not beat her first.
And I mean, you have so many Fragments where Sayo did kill everyone. But well most people who really think she was unable to kill don't believe in the meta and fragments at all either so
I think what's more important than whether Sayo would or wouldn't have 'really done it' (though, if all pieces must act 'in character' on the board, then Sayo must have been capable of it due to that rule), is the fact that she set up the perfect environment for a murder, and she intended to commit murder.
Ryukishi talks a lot about considering the environment that leads people to commit crimes, such as murder, or to commit suicide. Following that, the people who create such environments must also bear some sort of blame, right? It's true that Sayo themself grew up in an abusive situation that led to their actions and intent to commit murder, but Sayo also created the perfect situation for murder to occur, whether by their hand or by others', through the gold, the cards, the guns, and the bomb. It's directly due to that room and Sayo's actions / setup that Kyrie and Rudolf realized that they could commit murder, get away with it, and make bank.
With regards to guns, I've always been told that you should only aim it at a human being if you're willing to / intend to shoot. If it's a fake gun to scare people away, that's something different - but in this metaphor, Sayo was holding a live gun with the safety off.
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