Mutation? No. This is the human condition. What's changed is that people have been left to their own devices and they're showing the world just who they are.
"My feelings would best be expressed in a monologue... From the made-for-tv movie portrait of a teenage centerfold, starring Miss Lori Singer from 'Footloose'... It excites me, daddy. Don't you see ? I like it when the men look at me. You try to keep me trapped here in this small town...Like a little animal. But I am bustin' out, daddy. I'm gonna see the world, and the world is gonna see me. They're gonna see all of me, daddy. - All of me !" - Molly Shannon as Mary Katherine Gallagher in 'Superstar'

I don’t believe it’s just ‘the human condition’. These people are not even showing a basic common sense of self-preservation.