I hope the Iranian authorities will ensure there is a full investigation into the circumstances that led to the shooting down of PS572. They have taken the first step by accepting responsibility. However, there are many unanswered questions that the victims families and friends would like to be addressed to help them come to terms with their loss. I was moved by an interview of one of the victims who was quick to correct his interviewer that it was not an "accident". Of course it is not certain if it was an accident or a misjudgment or whether the civilian aircraft was deliberately targeted. I think that these questions should be properly addressed for everyone's sake including the Iranian authorities. The most likely explanation is that an overly paranoid operator wrongly identified the aircraft as a threat for reasons that should be further identified. But that is not the only possible explanation. The aircraft had a large number of North Americans on board, it may have had covert operatives on board, it could possibly have been deliberately targeted. Equally, it could have been a complete mistake where the launch was totally unintended.
In any event, it was yet another tragic loss of a civilian airliner by military action. The risk to civilian air traffic is considerable and needs to be reevaluated.