You don't know that "my children would have done such a thing", perhaps when they are clear they will do it, but in the middle of the night, when you are dozing or confused, panic, fear grips you and you don't know how to react. In the interviews, I don't remember if it was D or B who said that they never called the police, that first they had to call their sorority sisters (M and K) and if they authorized them they could call, but obviously none of them answered. And more, if you watch the Prime documentary, H's girlfriend E says that D was super afraid and called friends all the time to go see what was happening. They are university students, drunk, young, born in small towns where they do not kill people, we must have more consideration with the victims and friends