Shooting down civilian jets, can the US truly have pointed fingers at the Russian separatist in Ukraine?

When it comes to Uncle Sam pointing fingers at who shot down what civilian jet, isn’t it like the pot calling the skillet black? Uncle Sam did the same if not worse. Back in 1988 a good friend was serving on the USS Vincennes. He was an eye witness to the whole incident. He was not part of the crew that actually fired the missile that downed the Iranian air bus with 66 children aboard, but the incident troubled him greatly. He suffered PTSD because of it. He started to feel better about it because of the lie he was told, that the jet was broadcasting a military signature along with a civilian signature and was descending toward the ship. When the ship was decommissioned and scrapped the real truth came out; the Vincennes was not only in Iranian waters where it wasn’t supposed to be, the jet was climbing and was never broadcasting a military signature. The US never admitted guilt or apologized. Uncle Sam was quick to blame the Russian-leaning separatist because he backed the West-friendly government of the Ukraine, maybe to use the incident as an excuse to get in the mix on the side of the Ukrainians, or to better arm them. Lo and behold, IT WAS the Ukrainians all along. Doesn’t that seem very hypocritical, and a rush to judgment, Uncle Sam wants to blast the Russian-leaning separatist for doing something he has done, mistakenly or not? Even if the Russian-leaning separatist had done it, how can they be charge with a war crime when the Captain of the Vincennes wasn’t?