The Outer Space Treaty

Not enough that we have weapons to destroy us all many times over here on Earth, the big nations are now moving weapons into Outer Space with America attempting to bring in a version of the Space Forces that Russia have had since the 90s. 
What nobody seems to be mentioning is the 1967 Outer Space Treaty or to give it it's full name, the Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies.
Signed by all the big military players, China, Russia, France, the UK and Russia, it bars the signatories from placing weapons in Earth orbit, the Moon or any other celestial body and is overseen by The United Nations Committee on the Peaceful Uses of Outer Space (COPUOS).
The UK have said that they are preparing actions to counter 'intensifying threats' emerging from other nations in space and are looking to expand the role of RAF Air Command to take in military space operations while Donald Trumps America is creating a Space Force in order to counter Russian and Chinese operations.
The Chinese have the People's Liberation Army Strategic Support Force responsible for 'combat operations in space' is up and running while the French Joint Space Command's mission is to: 'contribute to the operations in coordination with military operators'.
As nations are already stuffing space full of military hardware, why is the UN not screaming and waving the Outer Space Treaty that they all signed up to at these countries?
If only we put as much time and effort into making life better for all of us living on Earth rather than thinking up ways to maximise killing each other than we would be so much better off.