"If you no longer go for a gap..."
I just don't see what the problem is with someone using everything they can to win a race? The opportunity was there, Seb took it.
There's nothing unfair about it. Mark had all the same tools available to him and came out second best. The moment Seb made it clear he was going for the and pass that was it, gloves were off, chips were down, it was a straight fight, and Vettel won.
http://www.youtube.com/watch?v=j2gv9WrjSeQ&t=1m18s
Vettel may have taken an opportunity but it was not 'fair and square'.