Patrick Bateman was the over-the-top embodiment of Yuppie Greed. Even though Bateman was crazy, a lot of guys still aspire to Yuppie Greed.

Amy is the over-the-top embodiment of the psycho ex-girlfriend. No girl aspires to that.

And Tyler Durden was a revolutionary. People often are drawn to them. There's nothing revolutionary about Amy at all.

The closest message Amy could be trying to make is You should love people for what they are but a) who she pretended to be was better than who she is and b) you shouldn't love people if what they are are psychotic murderers.