This is one danger of brinksmanship, which is that people's fingers are hovering a little too close to the trigger. If that is indeed what happened here, we can only hope that the powers that be realize that their saber-rattling was a cause of these deaths.
The OP talked about brinkmanship and how having ones forces on edge can lead to these disasters. I pointed to two other perfectly relevant examples that support his/her comment.
One of the examples just happens to be the US shooting down of an Iranian airliner, which is notable for obvious reasons, but was not intended as some kind of "justification" or other such silliness. I provided the link since younger readers might not be familiar with it (unlike the 2014 incident).
I'm Canadian. My country lost 63 citizens. Another 75 of the victims were residents. 138 souls. So, despite what you assumed, I have no agenda other than learning more about how these things can happen. As of this moment, our Prime Minister is giving a news conference indicating he believes it was indeed an (accidental) missile strike.
https://www.ctvnews.ca/politics/intelligence-indicates-fligh...
So Khamenei and Trump.
I wouldn't count on it.
It raises the question how you even can manage having an active / ready to fire anti-air system online and commercial planes active?
https://www.cnn.com/2020/01/09/politics/is-iran-ukraine-plan...
The CNN article says that Newsweek was first to report the story:
https://www.newsweek.com/iranians-shot-down-ukraine-flight-m...
The video showing a missile hitting a plane and later catching fire and crashing. Pictures of a missile at the crash site; shrapnel damage on the plane for sure. Unclear if it's legit or not, but lets say it's legit. It was shot down.
If it were Iran who shot it down. Why were there multiple people awake in the middle of the night recording a dark sky on the off chance Iran shoots their own plane down? If it were the Iran government they wouldn't want evidence like that.
Why were the Americans so quick at being able to say Iran shot down the plane?
Is it perhaps because (label group here) had an Iranian AA missile to use in Tehran. Had their agents record the missile attack so that they could blame Iran?
That's the more likely story.
Interesting how Trump was very untrumplike calling for peace earlier.
Interesting how there were no American citizens on that plane.
Not sure who did it.