His self-sacrificing attitude probably came from the fact that the prosecutors forced the ED to see the photos of the people who were killed by the fat man in reality. This should have an impact on the ED. He may have realized that "himself" had a lot of sins, although these sins were committed by another personality.
If the last survivor is ED, even if the child does not attract people's attention, it will be very difficult for the child to get rid of ED in the end. After all, ED has more power than Paris.
But having said that, for people with split personalities, can several personalities really be integrated in this way? After all, it's just a very dramatic speculation by the screenwriter and director to speculate on that state with ordinary people's thinking. However, since it is a movie, the drama is understandable.
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