I have no idea what Jurati could have heard that would explain her behaviour. She didn't just killed Maddox with a phaser, but used a method, where he also suffered a bit before he was finally dead. And this happened in the same universe, where utopia seemed to become possible at the ages of TNG. So, in my eyes, PIC stands and falls with the explanation of the mystery. They really can create a 'darker way' of the Trek Universe, no problem, but they need a very good reason for it.