Binging and purging is in some respects a form of self-mutilation, much like cutting.

It's also an attempt to gain control of a situation, when there are other situations beyond one's control.

In my opinion, it's a way of rejecting something one has been fed, as it were.

Being fed a load of bullshit makes me want to throw up. Watching someone else swallow it, even after being informed it's bullshit, makes me violently ill.

People believe what they wanna believe.