I liked the movie. After the dreary Man of Steel, where I felt that I went down two miles into the dark ocean, this movie moved me back closer to the surface.
I think Gerry's decision would not be unfamiliar to Star Trek fans. There was a time when Leonard McCoy made a decision to inject himself with a medicine in a situation where he didn't know if his actions would save his life or condemn him to death.
A member of the staff at the WHO mentioned there was a natural precedent for what humans did at the end of the movie. Does anyone know what that precedent was?