well that's absurd. No one who knows anything would say that iran poses no security threat to the US.
Obvioulsy A nuclear armed Iran poses a massive security threat to the US. And they really want nukes.
and even if you discount the nuclear threat for some reason, Iran has long been a major supporter of terror against the West. They support all kinds of violence all around the world.
Specifically against the US:
In August 2022, the U.S. Department of Justice charged an Iranian operative (Shahram Poursafi) with "plotting to assassinate former President Donald Trump's national security advisor John Bolton."[9] Poursafi, a member of Iran’s Islamic Revolutionary Guard Corps, was charged for "providing and attempting to provide material support to a transnational murder plot".[91][92][93][94] According to reports, Mike Pompeo was also a target,[10] where a bounty of $1 million was placed for his murder.[95]
Masih Alinejad, a journalist and human rights activist, has been a target of Iranian theocracy since fleeing Iran in 2009. In 2021, the FBI intercepted a kidnapping plot against her by Iranian agents who had planned to kidnap her from her New York home. U.S. prosecutors charged an Iranian intelligence officer for the kidnapping plot. In 2022, U.S. police arrested a man who had tried to break into Alinejad’s Brooklyn home while in possession of an AK47.[8][96][97]
The United States State Department has accused Iranian-backed Iraqi Shia militias of terrorism against U.S. troops, and Iran of cyberterrorism, primarily through its Quds Force.[98][99] Recent Iranian state-sponsored activity has included destructive malware and ransomware operations. The Office of the Director of National Intelligence's threat assessment concluded that "Iran’s growing expertise and willingness to conduct aggressive cyber operations make it a major threat to the security of U.S. and allied networks and data. Iran’s opportunistic approach to cyber attacks makes critical infrastructure owners in the United States susceptible to being targeted".[100]