Mike,
A catastrophic bird strike doesn't tend to force the aircraft to drop directly out of the sky. If a 400kt Hawk took a goose to the engine directly over a built up area, it would have an enormous amount of time to trade speed for height and select somewhere to leave the aircraft.
The Hawk's never had a double hydraulics failure, and I can't recall a single instance of an RAF pilot suddenly passing out in mid flight for no reason. They've had their accidents in fields and over the sea because that's where the risk of bird strikes are, and that's where well-trained professional aircrew place their stricken aircraft after an emergency, rather than just abandoning it into a built up area.
What, specifically, do you think might happen to a RAFAT aircraft that makes this an unacceptable risk?