Defenses vs. Flight

Most of the defenses have no effect on models with Flight. Would it make sense that 80mm and 120mm models with Flight would not be able to destroy defenses by moving over them? Currently by RAW, a Sky Raider/Bomber can fly over and destroy a defense with no threat of any ill effects.

It is intentional that sky raider and sky bomber can remove defences and scatter.

If it helps visualize it they have tons of bombs to drop and destroy the terrain.


A related question:

Does a model with Flight have to remove a defense if it moves over it (as a model walking the ground would, or can they choose to do so, or do they only remove it if they contact it?

Removing the defence is non-optional