It's been three months since I finished ShB, and there is still one thing no one has been able to explain satisfactorily during all these back-and-forth discussions.

Why is it okay for Hydaelyn to have ended the existence of everything on the Source by splitting it into fourteen bits but not okay for Emet Selch to end the existence of all those bits by bringing them back (rejoining) them into their original form? I am struggling to see how these two acts differ.

If separating them isn't killing them, how is rejoining them killing them, to put in another way?