If this is what really happened then yes they should be punished. No questions. But it was most likely a mistake anyways. It happens often enough. Ukraine shot down Siberia Airlines Flight 1812. It then tried to deny etc. etc. The US shot down Iran Air Flight 655 and had also tried to cover it up and after being cornered had never apologized.

The US admitted that they shot down Iran Air Flight 655 within hours and issued an apology.

Russia still denies Malaysia Airlines Flight 17 years later.

This is a bad comparison.

There was settlement. No official apology. The US "expressed regret" you can read about it on Wikipedia. The USS Vincente shot down civilian aircraft that was transmitting whatever signal it was required to be recognized as civilian. Yes it was an accident. They did not have it as their mission to down passenger airliner.