I don't watch a lot of F1, but caught the race in Malaysia and you generally hear/read a lot of interviews from the drivers over the course of a year on the news/web etc. The one thing I have got from every interview is that Vettel, despite 2 titles, and Hamilton, god's gift to the media a few years ago, both give the impression that they feel they have a lot to prove and are always looking for a negative, whereas the interviews I hear Button give, he always seems to be relaxed and is honest enough to admit when he makes a mistake, rather then blame someone or something. Perhaps this is because he feels that he has 1 title and as he is a little older, is not so worried about the media's opinion of him.
And as for the incident, it was Vettel's fault!