Seems to me it's entirely valid to ask whether or not Webber will feel compelled to help Vettel this season.
AFAIK, he's on a one-year deal. I would think that Red Bull are unlikely to replace him mid-season. No matter what, he probably won't be re-signed next season.
So really, he doesn't have a lot to lose by retaliating against Vettel, does he?
It has been said that man is a rational animal. All my life I have been searching for evidence which could support this.
-- Bertrand Russell
To make an apple pie from scratch,
you must first invent the universe.
-- Carl Sagan