In the movie djinn 2013

It turns out that salama the mother from a young Emirati couple killed Khalid’s baby. The baby supposedly died by accident at first but at the end it was found out the young mother killed her baby because she recognized the baby as part jinn. Her husband khalid had no idea of his true parentage being half human and half jinn until the end of the movie. Yes these djinn were evil in the movie but is it not also evil to kill an infant because of his/her demonic heritage? I didn’t feel that sorry for salama dying at the end because she killed her innocent baby. Although I’m not sure why her family had to die too. It’s not fair in my opinion in these stories to kill innocent children and people because they are djinn, nephilim, or whatever. Also how could God kill many innocent people in a great flood because they are half angel half human?