@Bentley...
What's wrong with you? Let's play your game. Superman died by a punch that didn't even destroy the city block they were fighting in.
http://m1180.photobucket.com/albumview/albums/galanpics/dos_supes21.jpg.html?src=www&action=view¤t=dos_supes21.jpg
How does that make your lame argument look? Now what we CAN do is say that it was Doomsday power that killed Superman OOOOORRR, we can go the terrible route you are going and say building level power is enough to kill Supes. I can also post Doomsday knocking Superman out by slamming his head into a pillar. I can also post Doomsday koing Superman by slamming his head into a mountain. We know that this is pointless since Doomsday power dropped Superman rather than vice verse.
Also...what makes your argument even worse is, Master Roshi and a Piccolo at a power level lower than 400 destroyed a moon effortlessly. On their best day, they couldn't even put a scratch on Raditz body...I don't even have to use a Super Saiyan. This has been proven on panel. Even though Roshi can effortlessly destroy a moon, that doesn't mean he can harm Frieza. Moon busting power means nothing to elites in DBZ. Hell, Raditz, one of the weakest villains in DBZ could tank that crap. So get out of here with Goku being dropped by ramming his face into a moon because that's a lie.
Planet busting means crap to DBZ characters. On panel it was stated that Saiyan Saga Vegeta could lay waste to a planet. He put everything he had in stock and threw it at Frieza and he was at a MUCH higher level of power and Frieza smiled at that crap. He then got his most powerful blast kicked effortlessly by Frieza pinky toe. Moral of story...its not the planet destruction that's killing any of the DBZ characters, its the power from the enemy that is doing it...common sense. The planet being destroyed is just a side effect. Frieza withstood a planet blowing up on him and he was near death when it happened...Trunk turned Frieza to dust with a casual blast and Earth was still intact. 1+1=2..do the math.