Question
Those damned IRBs not letting us ruin people's lives in the name of science!
I've always felt that the most disturbing thing about a body transplant would be the fact that you will be constantly, unavoidably tasting somebody else's sputum (and feeling their cavities with THEIR TONGUE). There would also be serious odour issues I imagine.
It's not theirs anymore.
That would be a point; what point does you concept of "ownership" of a mere collection of atoms change? It's said that you already posses atoms that were once part of Hitler, Ghengis Khan, Jesus and so on, and the water you drink once passed through dinosaurs. Our minds aren't really built to accommodate reality like this.
I think you just pulled the Ultimate Godwin. "Ha, I'm right because you're Hitler!" "No, you're Hitler!" "Oh my god, we're all Hitler!"
Everyone is also Jesus... in purgatory!