Franco said he had been inspired by Martin Scorsese's 1976 movie Taxi Driver.
"It was certainly a model for me, where you have a crazy guy at the centre but he is compelling and you want to follow him," he said.
"Usually with subject matter like this, it would fall into the horror genre. But this is not a thriller or a porn movie, it's a character study," he added.
Haze creates a character who disgusts but at the same time evokes pity from the viewer.
"Here's a killer that is bumbling, not so much a dark killer in the woods as a man who doesn't know what he's doing," Franco said.
Haze said: "Those around him in a way are even more violent."
The local police and villagers watch Ballard - who dresses up in women's clothes - with growing suspicion but make no attempt to approach him.
His desperation increases when he accidentally burns one of his precious corpses.
"Those around him become peeping toms, fascinated with this character," Franco said.
"There is a sort of underlying violence to everyone, it's just more ruled by the dictates of the law."
- AFP