I feel like all the people saying the girl is stupid are incapable of empathy. You're coming at this like detached 3rd party readers, rather than putting yourself in her shoes. Ironically, just like Vassago, who calls humans foolish exactly for this reason. He sees them from a detached angle. The villagers cut off her arms because of revenge, having lost their own family members, and because of fear. Yes, this is stupid, but humans tend to be stupid when they're scared, angry, and starving to death. Some are saying the husband would have taken revenge on the villagers, but would he have really? Unless you're a psychopath, your first thought is not "I'm gonna kill these people." These people are his friends and family, and their anger is mostly justified. A much more normal and easier response is blaming yourself, which is exactly what he did.
As for the girl erasing the husband's memories, you're acting like she erased all his memories; she didn't, just the parts that included her. She blamed herself for her husband's attempt at suicide, she felt like he would forever carry the guilt of what happened to her, so she needed to remove that burden. So she erased herself, without the need for anyone to die.
Alternatively, she could have just asked Vassago to just erase the husbands guilt, but people don't think 10 steps ahead in situations like this. People are driven by grief and emotion. Also, it's a story. There has to be some level of suspension of disbelief so that the story can deliver its message and emotional impact. Sitting here like some General trying to strategize the most optimal outcome is obviously going to ruin the story. It would ruin any story. Just sit back, relax, and enjoy it. Yeeesh.
