In 1953 the United States backed a coup to install the Shah in place of Mohammad Mosaddeq who was the democratically elected leader. In the long memories of Iranians this caused a great resentment among their people. When the Shah was eventually overthrown the U.S. Embassy went down with it and the story of the hostages began.
Now the U.S. has backed another coup leader in President Gen. Pervez Musharraf even though he is not wanted by the people of Pakistan. When he is eventually overthrown we should expect an increasing resentment from their people against the United Stated because of our intervening foreign policy. And oh by the way...Osama Bin Laden is hiding out in Pakistan...and oh by the way again...they have a nuclear weapon.
Our policy is right now creating the very Iran we're afraid that could emerge...except it's in Pakistan.