That is true, and yep, I am familiar with that tragedy. But some (many) of us know to not open fire unless the enemy is positively identified. If unsure, don't shoot. But we too could get affected when oxygen deprived.
My stats say I have killed one friendly aircraft online, but since I have only shot down two enemy fighters, the friendly must have been some freak random accident. Maybe a spawn collision or hit by a stray mk 108 30mm shell. Even the rear gunner could have hit a friendly far away that was already going down by mistake when spraying. The rules of FPS games, and Armed Assault, are like a reflex to me. Don't shoot until sure.