As usual, John Oliver has a great rant on the subject.
Right now, the US has more nuclear weapons than they can safely take care of. Manning the silos is now a demoralizing job, because those people basically do nothing and yet the job is tremendously tedious. So it ends up being done by people who really shouldn't be in such an important position, and do not take enough care in their job, especially given the dangers if something were to go wrong.
The US is the only country to drop a nuke on a civilian population. Everyone knows about when they dropped a couple on Japan, but few people remember when they accidentally dropped one on North Carolina. It did not explode, but it was one of a number of close calls that have happened over the years.
As it is being managed now, the nuclear deterrent is more of a danger to the US than to anyone else, though it is also a danger to planet as a whole. I don't think a complete disarmament makes any sense in the short term, but a move towards scaling back to safe and sustainable levels would make sense. However, those that benefit from such massive and useless military spending are not about to let it happen without a fight.