Is that really true? The international community has various safeguards in place to allow the use of nuclear power without enabling proliferation of nuclear weapons. Ignoring a few governments which intentionally attempt to subvert them – and almost always get punished with sanctions for doing so – those safeguards work. Most countries which don't have nuclear reactors, it is because they don't think it is an affordable or worthwhile investment for them (given the capital cost, expected returns, environmental risks, etc). There are a few countries locked out of international nuclear energy markets due to sanctions, but they are very much a minority.