After giving some thought about the Redbull situation, I am more or less certain that they did try to engineer a Vettel victory and were cought with their pants down trying to cover it up.
In Helmut Marko's public outting while putting the blame on Webber, there are indications that Vettel was told to seize his opportunity and apparently, Webbers mechanic was to inform Mark over the radio to let Vettel pass. To back this up in a justifyable way, fuel differences were cited (Vettel being able to be 1 lap longer on a more potent setting, while Webber turned down his in lap 38 - 2 laps before the overtake attempt). Problem is, Mark either didn't get the memo (accoarding to some rumours, the mechanic didn't inform Mark that he was to let Vettel pass) or he did, but decided to give room, but just enough and not make it easy, being not happy with the situation. That would explain the his move that was neither very defensive nor very inviting.
Vettel then seizes the opportunity on lap 40, comes up next to Mark on the left side and tries to pass. Webber doesn't yield an inch - Vettel goes right and hits Webber and the rest is history.
Now, if this were anything like a normal overtake situation between two racers (irregardless if within the same team or not), I sincerely doubt Vettel would for one, turn right in an effort to get on the racing line and two, after it goes wrong, to get out, pointing mad and crazy gestures at Mark. When he was overtaking, Vettel was expecting Webber to conceed position.
This is the only logical explanation, why Vettel insists that it wasn't his fault and the team, after he had returned to the pit, openly comfortes him and various people within the team put the blame into Webbers hand.
It also explains why Webber would be so diplomatic at the post-race interview. To me, he nearly looked as if he felt guilt and was trying to justify that the accident happened because Vettel moved to his right into him (two instances - right after the race to Button and then during the post-race interview with Hamilton). His comment about to "dig deeper" also implies there's more to it than meets the eye.
If this was anything like an ordinary race incident, Webber would be furious to have been put in that situation and having lost 10 points. The way it is though, I think he knows that Vettel is the clear favorite at the team and that they would rather have Vettel in the win. It also raises questions about Webbers future at Redbull. He doesn't have a contract for next year yet and I think these latest events (and his good performance) might not help him much.