I wouldn't say Anti-War as much as Anti-nuclear weapons. ("Anti-proliferation" doesn't sound accurate either.) It's only controversial if one considers fully engaged nuclear war between the super powers to be winnable. That's undisputable. Certainly affected one viewer by his own admission: Ronald Reagan who 4 years later oversaw the ratification of the INF Treaty.

A really good, powerful(and depressing) movie. And a TV production at that!