IMHO, they expected a retaliation from us over the missiles they had just launched a few hours ago, and they had the sensitivity maxed out on their missile defense system, which made it designate the airliner as a threat. I don’t believe they did it on purpose.
Why this flight and none of the other eight departures that occurred previous to this one (Ukrainian Air flight highlighted).
That shot of departures out of Tehran on the morning of doesn’t leave me with the feeling thy Iran was in a Weapons Free mentality.