if that same government is also funding wars through cats paws in other countries and oppressing their own people, you should be concerned. There are plenty of governments, especially authoritarian governments like in Iran, that I don't think should ever acquire nuclear weapons for any reason.

It's more like any dictator/autocrat who wants to stay in power by threatening the world will work on it. That isn't good for the world. Your statement is not a value judgement or even interested in first or second order effects of such a decision, so is essentially useless in evaluating whether something is good or bad.