American crime Movie Psychology Point Of view

watch this movie american Crime .. i think this is kinda similar with Girl Next Door ?

Creepy things that i found this is reall STORY! weww.. why someone able to think that Sadism and able to think how to hurt people so BAD!

no only fiscally also mentally, the problem with betrudice.. i think its more that she saw sylvia as someone who STRONG! independent and mature, the things she want to break that! she want to see sylvia become weak and begging for mercy to her,Fact that sylvia never cry, hurt Betrudice so Much! and make her Crazy! like she said at the movie "Im able to feel the pain but I CANT take the pain any longer.. " betrudice said that to Sylvia, she want sylvia to cry and become weak, but sylvia not doing those all, betrudice feel that she the only person with those pain and sadness, powerless with lot of children, and she want to see othe people more desperate!

But again, as story said, Sylvia never Cry when betriduce and her children torturing her
and ended with Death of Sylvia ..

Creepy enough!