Do you not perceive a threat from a country with nuclear capability that chants "Death to America, Death to Israel" to be a threat to America? Venezuela I don't know about, but Iran was (is) most certainly a threat to America.
If it's moral to strike at a country with nuclear capability that talks constantly about your country's destruction, then it's no less acceptable for Iran to strike the US than the other way around.
You can't condemn one and condone the other on that basis.
Iran has no nuclear weapons and no weapons capable of striking the US
North Korea engages in no less saber-rattling. Why is the US not attacking Kim Jong Un?
Iran with nukes can't hold a candle to the threat posed by the USSR. Your logic would have turned the Cold War into a shooting war.