Iran is designated as a State Sponsor of Terrorism, that's why. along with its "Islamic Revolutionary Guard Corps (IRGC)" who are a designated terrorist group.
It supports Hezbollah, the Houthis, Palestinian terrorist groups in Gaza, and various terrorist and militant groups in Iraq, Syria, Bahrain, and elsewhere throughout the Middle East.
Otherwise known as the head of the snake. Even Russia is against them getting nuclear weapons. What's wrong with you?