18 year old maniac murders his mom and roommate

Roommate and mom murdered

In a rage ordinairy people can turn into beings far beyond animal instinct. Some of the acts we can see in images and videos here are beyond a rational persons comprehension. Seemingly docile people turn into bloodthirsty animals that complete their ‘task’ with deadly accuracy and precision.
So did this 18 year old kid who first killed his mother and than viciously killed his roommate before defiling her body.

Is there a demon sleeping inside each of us?