The right of Iran’s nuclear weapon

Why is it wrong for Iran to have a nuclear weapon? Other countries including Israel have them. The answer to this question seems to be that Iran is more likely to use it against Israel. For some reason Iran wants to destroy the USA and Israel.

So it is right for Israel and the USA to act preemptively to destroy Iran’s nuclear weapons program as an act of self-defence. Both countries allow the existence of Iran whereas Iran wants Israel and the USA to cease to exist.

If Hitler had had a nuclear weapon, I am sure he would have used it during the war.

So it is not wrong for Iran to have a nuclear weapon, but it is wrong for them to use it to destroy another country.

The USA used two of them to destroy two cities of Japan during the war. The USA wasn’t seeking to destroy Japan, but to end the war.