There's a lot going on in Childhood's End. Some of this story is about how religion and people's conception of it might change after first contact, and some of it opens up the question of whether or not humans are really ready for it.
This is science fiction as it should be. The story itself doesn't take a definitive stance on whether or not the aliens were right to do what they did, but treats their motivations as being so inherently alien that it's difficult for a human to judge them. It allows the viewer to make up their own mind and challenges them to think about it.
It's unfortunate that so few people have seen this. It's really worth seeing, especially if you're already a fan of the genre.
This is science fiction as it should be. The story itself doesn't take a definitive stance on whether or not the aliens were right to do what they did, but treats their motivations as being so inherently alien that it's difficult for a human to judge them. It allows the viewer to make up their own mind and challenges them to think about it.
It's unfortunate that so few people have seen this. It's really worth seeing, especially if you're already a fan of the genre.