Historical context: the KAL007 incident immediately followed the intrusion and activity of a USAF Boeing RC-135 recon plane that was in literally the same spot earlier that day. This aircraft has the same radar signature as KAL007.
The Soviets, in a hurry to shoot the spy plane signature hundreds of miles off civilian air routes while it was still in their territory (the second time the unresponsive KAL007 crossed it during the flight), shot it down.
Yknow, as regularly and justifiably happens with spy balloons today.
Russia does enough bad shit without the propaganda, going full onion just makes it seem laughable (not saying you are, this is just an extremely common take).