Right, the Islamic Republic of Iran just wants to live their lives peacefully. And they do nothing bad.... like, sponsor Hezbollah or ship weapons or participate in kidnappings. Nope, if the US went away, everything would be right as rain in Iran. Right?
The Islamic Republic of Iran wouldn't exist without the US. Remember, we destroyed their democracy in 1953 because they were trying to nationalize their oil fields, and kick us out. British Petroleum began its life as Anglo-Iranian Oil, which was known as Anglo-Persian Oil before that. The company was literally founded on the outright theft of all of Iran's oil, along with a handful of American companies that got their cut after Operation Ajax was complete. We installed the Shah, he repressed and radicalized the population with our money and training, and then the people revolted, as they often do.
We helped Britain divide and administer their post-war winnings after WWII that largely has started all of this mess. (Do you think oil-rich Iraq was divided equally into Kurdish, Shiite, and Sunni populations by accident?) We backed Saddam to punish the newly independent Iran after they overthrew our Shah. We participated in the proxy wars which destroyed Afghanistan, Iraq, and Iran in the 80s. We allowed Pakistan to develop nuclear weapons -- as in, we certified them as nuclear free every year -- during the 80s in exchange for helping us smuggle weapons into Afghanistan. We backed Mubarak. We were pals with Gaddafi while he was torturing and murdering people because he was selling oil to us, but that was all the way back in 2009. We allow Turkey to murder and suppress Kurds at their whim because they are an ally. We didn't say much about Syria at first because it was one of our blacksites. We're still watching Bahrainis get murdered because we like the sitting government that allows our fleet that we use to project power into that Middle East to have a massive billion dollar operations base.
The US isn't the root of all evil, but in the modern Middle East, it's the root of most of it.