Because we are mere dweebs, mortals who are not yet Vets. We have feet of clay yet we have lofty ideas. Tied to the ground and our normal lives we dream about flying. The seemingly simple choices of combat have a vast allure for us. Yet once there there are no simple choices. There is only life or death. Yet death is not the end, we can spawn endlessly, so we end up flying unrealisticly.
We all want realism to a point, "our" point perferably.
But who would build a flight sim where you get exactly 1 plane per day? Kill it and your done until tommorow. Then you would see less unrealistic flight. People would fear death.
But who would fly such a sim? And it seems obvious it would go bankrupt shortly.
Even in the TOD which is the best most realistic flying to be had in AH IMO. Still I do not fear death like death. If I die attacking a JU-88 I was stupid, brave but idiotic, or perhaps even heroic.
But I can go to the CT, or Main and FLY again.