[Spooky23]

As a defender, you only need to fail once. Blow up a few B-2s on the ramp and that becomes a event with unlimited bad potential.

[urikaduri]

By the time it takes the missiles to reach there, the planes could be in the air.

[machomaster]

Could be. But won't be. The flying time to target is mere minutes, and taking the plane from zero (not even crew inside) to air takes much longer than that.