You may be right in that using nukes was the wrong call. IMO, it seems like it was the best of bad options.
Saying there is no excuse and you disagree with something are two different things. The phrase “no excuse” is saying you think it is objectively wrong in a way that sounds like it isn’t just your opinion. I don’t think you mean it that way, I’m just explaining why I really don’t like that phrase.
As bad as the nukes were, the conventional bombing of Tokyo was probably worse. Over 100k civilians were killed with 1,000,000+ left homeless.