Everything's possible, but there would be no debate about UI mistakes if it was Iran shooting down a US plane. They would've done because they are evil by nature, or at least perceived as such. In that case the media and the public buys into its own reality, but of course the UI discussion could be a distraction from the public maybe starting to question if that's actually the reality.

Also from the Wiki page about this shootdown:

In 1991, political scientist Robert Entman of George Washington University compared U.S. media coverage of the incident with the similar shootdown of Korean Air Lines Flight 007 by the Soviet Union five years earlier by studying material from Time, Newsweek, The New York Times, The Washington Post and CBS Evening News. According to Entman, framing techniques were used to frame the Korean Airlines incident as sabotage while framing the Iran Air incident as a tragic mistake,[67] stating "the angle taken by the U.S. media emphasized the moral bankruptcy and guilt of the perpetrating nation. With Iran Air 655, the frame de-emphasised guilt and focused on the complex problems of operating military high technology."[68][a] By "de-emphasizing the agency and the victims and by the choice of graphics and adjectives, the news stories about the U.S. downing of an Iranian plane called it a technical problem while the Soviet downing of a Korean jet was portrayed as a moral outrage."