The mind being separate from the body is actually very common across all kinds of religions and sects, the difference is in how the concept is handled. The one-and-done physical-body rejectionists see existence in and of itself as some kind of punishment, and I don't think that's where the trans-sexuals are actually coming from. Seems more to be where the emos come from. :P

They're more of the "I was born into the wrong body" camp, but without the concept of reincarnation to give them the idea that god or nature will get it right next time (never mind the idea that maybe being in the wrong body - especially a human one - is a deliberate punishment .....) SO they disfigure themselves. Though Tigerman supposedly was a reincarnationist, too, and he went the body-mod route, too, so. Some people just like the excuse to do shit to themselves (and some don't need excuses, like the ones that have all the tattoos and piercings just because it pleases them.)