Iran Is Negotiating With A Terrorist State, So Why Can't We?

Iran is willing to negotiate with the deadliest terrorist nation in human history, the United States of America, so what is so fucking scary about the US negotiating with Iran?  They are no threat to us in any conceivable fashion; the US and our incontinent lap dog Israel certainly are threats to Iran, yet the Iranians have the courage and wisdom to continue the diplomacy.  That's fucking awesome.  Why are we such fucking pussies about this shit?