According to wiki :
The event triggered an intense international controversy, with Iran condemning the U.S. attack as a "barbaric act." In mid-July 1988, Iranian Foreign Minister Ali Akbar Velayati asked the United Nations Security Council to condemn the United States saying the U.S. attack "could not have been a mistake" and was a "criminal act," an "atrocity" and a "massacre." George H. W. Bush, at the time Vice President of the United States in the Reagan administration, defended his country at the United Nations by arguing that the U.S. attack had been a wartime incident and that the crew of the Vincennes had acted appropriately to the situation. The Soviet Union asked the U.S. to withdraw from the area and supported efforts by the Security Council to end the Iran-Iraq war. The remainder of the 13 delegates who spoke supported the U.S. position, saying one of the problems was that a 1987 resolution to end the Iran-Iraq war had been ignored. Following the debate, Security Council Resolution 616 was passed expressing "deep distress" over the U.S. attack, "profound regret" for the loss of human lives, and stressed the need to end the Iran-Iraq war as resolved in 1987.
When questioned in a 2000 BBC documentary, the U.S. government stated in a written answer that they believed the incident may have been caused by a simultaneous psychological condition amongst the 18 bridge crew of the Vincennes called 'scenario fulfillment', which is said to occur when persons are under pressure. In such a situation, the men will carry out a training scenario, believing it to be reality while ignoring sensory information that contradicts the scenario. In the case of this incident, the scenario was an attack by a lone military aircraft.
The U.S. government issued notes of regret for the loss of human lives and in 1996 paid reparations to settle a suit brought in the International Court of Justice regarding the incident, however the United States never released an apology or acknowledgment of wrongdoing. In August 1988"
To find a better view about what political apology means:
You cannot apologize without accepting your responsibility about what has happened because of your wrong decisions,actions and reactions.
Surely wiki is a valid source and you cannot deny it about only one question and protect it about the other questions. If it is not a valid source all you answers from wiki are invalid too.
P.S: I found This interesting to read!