Using nukes to bomb entire civilian cities when the other side can't respond (US, 1945) is completely wrong. Using nukes against a conventional army is dubious

Using nukes to bomb entire civilian cities when the other side can't respond (US, 1945) is completely wrong. Using nukes against a conventional army is dubious - it is disproportionate in the extreme. The threat of using them may not be wrong (but I'm still not convinced on that point.) Then (as sister comment says) neither side was playing the game right in the cold war. I object to the way the game is set up in international relations - If we actually had a system to enforce international law it would be much much harder to justify having unilateral armies at all! My views on this are somewhat unconventional, though, so don't worry if I sound crazy; I may well be.