Not responding to anyone in particular (I've seen this in many of the reviews as well), but I get the feeling that arguing about caring after the MPD plot is fully revealed is the same thing as
Warning Spoiler! Click to showwhen many critics (Roger Ebert included) didn't like The Usual Suspects after its twist was revealed.
In both situations events are not real, but I think their method of presenting them was such that I continued to care about the characters even knowing full well the reality of the situation.
I mean, I sincerely wanted the characters to stop the killer before they were lost. I also really liked the idea of a personality who wanted to escape and be fruitful (minor pun intended) being the remaining personality in this guy's head.
Also, I could find the boy being the agent of killing to be totally plausible. I the small glimpses of MPD I've seen in documentaries, new personalities seem to develop to deal with certain issues, and having a boy be the angry type was perfect, especially given the more outrageous methods that he used (decapitation, forcing a bat down someone's throat). I thought it was so well done and a great way to end the film.
I wonder, however, if he will be able to stay on the loose at all after his escape. He has lost all of the practical personalities and is only left with the most extreme.
Was anyone else reminded of a scene from Hell in
Event Horizon when they showed the bat scene? *ouch*