To people calling Shirley "mentally ill"
Shirley and other murderers like her are one of the reasons that the stigma of mental illness exists. People calling her "schizophrenic" or "bipolar" clearly know nothing about either of those conditions. My mother suffered from bipolar disorder, and trust me, she was absolutely NOTHING like Shirley and never hurt anyone. Violent behavior is one of the misconceptions of mental illness. People who suffer from conditions like that are much more likely to harm themselves than others, and are even more likely to become a victim of a crime. Shirley was a narcissistic, manipulative sociopath. No medication ever helped her. What she needed was prison time (or at the very least, time in a ward for the criminally insane).
That being said, I'm a 29-year-old male, and I have literally never cried so much watching any movie. What she did to that poor family is beyond disgusting, and I hope she burns in hell. As if taking their son wasn't painful enough for them, she had to take their infant grandson too! I felt physically ill when it was revealed what happened to Zachary. I was hoping that it would end with the worst case scenario being that she somehow won custody of him and avoided prison time. I never thought that what they feared most would end up happening. So sad.