Descartes wrote:
I wonder why he felt the corpse from which he stole the foot had to be Jewish.
Either way, this is the strangest case of necrophilia I've ever heard.

It doesn't sound like necrophilia to me. He also didn't claim to the foot had to be Jewish, merely that it was. In all likelihood, the Jewish cemetery was simply closest.
I swear the current generation lacks common sense and morals. "Just because I wanted a foot"? That kid has severe issues.