The little detail that's giving Necrosha such an impact, IMO, is that so many of the "zombies" are having flashes of their actual memories in the middle of trying to kill their old friends and wind up horrified at themselves, so it's a bit of a heart-wrencher on both sides, really. Makes me wonder how many of them -- or if ALL of them -- are going to be sticking around post-event. That would be one way to sweep Decimation under the rug (and good riddance).