The issue is you can't easily enforce cooperation without some external overarching force (e.g. regulation), especially across competing powers.
Refer to nuclear arms race in general. A specific example on why not to be the only one to cooperate: Ukraine gave up nukes in order to push for group level rationality, gets walked over as an individual. Oversimplifying, but yeah that's the rough point.
Meditations on Moloch is a favourite of mine on this (albeit very depressing): https://www.slatestarcodexabridged.com/Meditations-On-Moloch