Vaderisnothayden said:

Vader knew it would kill the Emperor, because it did kill the Emperor. The Emperor's clones is just an eu story element thought up later and has no bearing on interpretation of events in ROTJ. And of course Vader was saving Luke from death.

Come now, it's a what if question. We all know it's an EU story, but why can't it cast implications back on events in the RotJ? The point of the EU is to get more of something you like, is it not? If so, don't you want it to actually cause you to revisit the thing that you like and maybe see it in a new light?

As for Palpatine transferring himself to clones via the force, there was never any indication before then (or in any of the films) that the force could do that.

Did we ever get a comprehensive list of things that the Force could and couldn't do? I must have missed that.

If you don't like the story, that's fine. But if you want to discuss this with me, please let's discuss it at the same level. If I ask what I think is a well thought out question and you respond with: "Teh prequels suck!" then we're not really discussing anything, are we?