I served in the US Navy for 5 years on submarines that were capable of carrying nuclear weapons (this was 30 years ago). That doesn't make me an expert on this topic at all, but perhaps I've thought about it a bit more than most have. Here are a few quick thoughts:
1. If I was given a magic button that could get rid of all nuclear weapons in the world and also get rid of the ability to make new ones and I was told I alone had to decide whether or not to push the button, I think I would almost certainly push it. But I thank God I'm not in that position, as I lack the wisdom and foreknowledge to make such a decision well.
2. We cannot now change the fact that nuclear weapons exist, nor that more can be made, nor that some nations possess these weapons that are evil nations (in terms of their governments actions, not in terms of their people being any more evil than other nations).
3. The US is far from a perfect nation, but in terms of freedoms for people and in terms of checks and balances on government power, we are, I think, one of the better nations in the world. I thank God that our military is probably the strongest military in the world.
4. I cannot see any better option than the US and our allies maintaining a strong nuclear force in order to deter nations like North Korea, China, and Russia from using nuclear weapons. The strategy of deterrence has been 100% successful for about 70 years now. For over 70 years, not a single nuclear weapon has been used in war. I wish there was a better option than deterrence through the maintenance of a strong nuclear arsenal and strong military, but I just don't see one.
5. The biggest risk I see is not that some other nation will gain a more powerful military and risk nuclear war (that is a real risk, but not the biggest one). The biggest risk is that the US will slide away from being a nation with the relatively strong moral foundation (through a lot of gospel light and Christian influence) necessary to maintain freedoms and effective checks and balances on government. If that happens, we might either let our guard down so that other nations feel free to risk using nukes, or we might even misuse them ourselves.
6. The US could tilt away from our relative goodness through either a radical right wing or left wing government. At this point, I feel like the threat from the left side is far greater.
7. What we need most is a change in the spiritual climate, a turning of the tide (what some call revival) where more and more people become more and more like Jesus. This would involve many people being born again, and many Christians becoming more devoted to Jesus and the gospel, and many people getting free from besetting sins, and an increase in the righteous fear of God throughout the land.
Those are my thoughts. May God help us.