The difference being pushing that hard got hamilton into and ahead of the drivers championship, button was just his usual midfield self.
Ross Brawn:
"There were two elements that were in contrast. What he needed was a steady flow of points. If you're leading a football match 3-0 at half time, you don't come out for the second half taking dramatic risks. In the second half of the season, Jenson drove mindful of the championship and wasn't going to take any risks, but there was fluidity to his driving in the first half of the year that wasn't influenced by that. Even Michael Schumacher had that tendency to become conservative when he needed to be.
In contrast to that were his race performances. In those environments the wish to compete, the wish to beat someone, became the defining nature of Jenson's driving. There seems to be this contrast between being conservative in qualifying and being aggressive in racing. Both can have the same negative consequences, but in racing it started to flow and the adrenalin and passion came in.
At the end of the day Jenson won the world championship, so you can't criticise his approach. If he had taken a less-conservative approach and lost the car several times in qualifying, where would he be now? The fact is that he's won the world championship and he's won it by taking that approach, so you can't criticise it.
He had a substantial lead by the middle of the season and everyone was saying, 'Well, it's yours to throw away, Jenson.' You've got to take that feeling with you to every race and it's not easy. The guys behind have nothing to lose."
^ Might enlighten you a bit as to how some drivers go about their business, from the words of the hugely respected and revered Ross Brawn no less...
During Hamiltons and Button's time at Mclaren I cannot remember one single DNF of Jenson's own doing, or where he collided with another driver, they were all mechanical issues or inflicted by another driver...
yet Lewis had plenty of DNFs through his own fault - look at how many times he was called to the Stewards... that many times that he had to play the race card in that terrificly embarrassing verbal explosion post race in Monaco, remember?