I know there's not really an answer for what makes people queer in the head. We'll probably never really know, but it might be helpful to speculate.
My theory is that being inbred for generation and eating their own feces is a contributing factor. Low-IQ individuals are usually pretty mellow, but when you cross that with a good inbreeding and a life of failure, you've got a good recipe for an insane, poo smearing, chalupa monkey.
What's less understood is how or why they are driven to forums, where they promptly pull down their adult depends and begin smearing poo all over their fat, clammy bodies while their inbred gay brother fucks them in the ass under a spotlight held by their sister.