Okay. To the KAL story.
There was a RC-135 in the aera. That had sniffed around a lot of times, came over the radar horizon and hide behind it. Again and again, contiuse provocation over some hours. When the KAL007 appeared, the RC-135 was on the way home, but the soviets thought, that the KAL Jumbo was the RC-135 again. Missidentifikation is easily possible, because the RC-135 has a humpback like the 747.
Some days ago, american planes violated the soviet airspace in big numbers, flew across Kamchatka penisula, which was seen as a humilation of the soviet air defence. The officers in Far east got serious troubles with STAVKA (soviet HQ), so that they were willing to stop every violation of airspace with using of fire.
The americans were aware of the soviet alert situation and knew that the kAL was away from its course. In this situation they could have easily contacted the KAL plane or via Red Telephone the soviets. But they did nothing.
The american side is as guilty as the soviet side for the dead of innocent people.
You say, the plane was indentified. This is only partly true. It was identified as a 4 engine plane with humpback and lights on the side. In the soviet air community is gave the rumour, that the americans used camo lights to cover their SIGINT RC-135 as Boing 747, so the KAL Jumbo was seen as american spy plane and thatswhy shoten down.
Of course this was a big mistake.
But only some days later the same ground contoller ordered an fighter attack on a soviet IL-22 sub hunter, because it was missidentified as P-3 Orion.