Well, in a lot of these true stories, there's a disconnect from reality. The person might believe they are acting in self - defense against non - existent threats or that they are on a'mission' given by some higher power. Also, substance abuse can sometimes be involved. It can exacerbate an already unstable mental condition, making it more likely for the person to commit a violent act and then claim insanity. Family history of mental illness is also a factor that shows up frequently.
One well - known true story is that of Andrea Yates. She drowned her five children while suffering from severe postpartum psychosis. Her insanity was a major factor in the case, and it sparked a great deal of debate about mental illness and criminal responsibility.
It's hard to say for sure. Sometimes stories like this might draw inspiration from real life but be embellished or fictionalized to make it more engaging. You'd have to research the author's intentions or any accompanying notes to know for certain.
There were two versions of the reason for the kindergarten teacher's murder. One theory was that the perpetrator's child was hit by another student's parent, but the other party did not compensate and was arrogant. This made the perpetrator very angry and chose to take revenge. Another theory was that the perpetrator's child had a fight with other children in the kindergarten, but the kindergarten teacher was biased towards another parent, causing the perpetrator to be resentful and choose revenge. However, the specific cause of the murder had not been announced by the police, so it was impossible to determine the exact reason.
It's not a true story. Usually, such titles are chosen for their intrigue and don't imply a factual basis. Authors often come up with fictional plots to entertain and engage readers.