unfortunately from the view of this game the answer is obvious no
if i give you the planet it will be fully functional if you glass the planet you will most likely destroy infrastructure or population either way you get a less effective planet. on top of that you will have to expend resources in order to capture it in the first place.
any way its more effective for me to refuse to hand over the planet.
further now that i know you want it and would prefer the planet in its current state i may just destroy the planet myself in order to deny you having it