"Oh and Buu destroyed Earth with a charged up blasts"
Oly- He wasent powering up. And he still did it with a single blast. Thats power baby.
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"which Goku didn't get hit by"
Oly- He was hit by blasts of that kind in other times he encountered Buu. Including blasts meant to kill him.
a single blast powerful enough to blast Earth aka non charged up > Blasts with the intent to kill aka charged up.
More simple, eh?
How about an example of the manga where a single blast was stated to have that effect, and Buu isent charging up?
http://img141.imageshack.us/img141/738/buu0dy.gif
http://img136.imageshack.us/img136/1918/buu11wh.gif
How about Goku taking those blasts at close range?
http://img136.imageshack.us/img136/2971/buu25ww.gif
Oh my.
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"or Freeza's (who destroys planets with his Death Ball technique, that sinks down towards the planets core). "
Oly- That was in the figth against Goku. On porpuse, and you would knew that if you had read the manga. He could survive in space. Goku at the time could not. He knew he had the advantage if the planet exploded, over his opponent. But still wanted to beat him by its own hands. Thats why he used a death ball to the planets core so it -wouldnt explode right away- (the real time of the figth after that was 5 minutes in the manga). It would give him time to beat Goku, flavour it and still survive.
The -first time- we see him do that he zapped a planet out of existence right away (Vegeta`s planet). It was a regular death ball (non - charged - up with the evidence he did it without -powering himself-) and he was at the weakest form.
So much for your arguments.