1) The man in the Moon really pissed them off.

2) It's the only way to turn the Moon into Swiss cheese.

3) Crashing and rebuilding spacecraft is their way of stimulating the economy.

4) We're racing Russia in the great "space crash" race.

5) They're hoping to collect serious bank from their insurance company.

6) It was their best marketing idea on how to "go viral."

7) It sends a clears message to the rest of the galaxy that America isn't afraid to bomb other planets.