Nuclear proliferation was always the massive risk- it was always clear that some nations would never accept that the 'West' was somehow allowed to have them, and other not. And that MAD (Mutual assured destruction) would only work for some time.
The development since of smaller, tactical and very targetted smaller nuclear weapons, that some believe could deliver a 'small and limited' nuclear attack have made that obsolete, and so has proliferation to the Middle-East, Russia, China and beyond. And to some States that were previously so called trusted Allies, and now have turned rogue states partly due to their new leaders, like Trump, Putin, KimJung and Netanyahu, and others. Proliferation was always going to happen, and was always going to be beyond massively dangerous. And the UK agreeing to have nuclear weapons on our soil for the USA puts all at increased risk.
Some of us tried in the 70s and 80s to explain- but it all fell on deaf ears.