My 2 cents, Vettel is purely at fault, even though I don't fully agree with the mangers comments.
Webber was there, Vettel decided to take Webber on an inside line that only "reckless" Hamilton would consider.
But come to think of it, Hamilton would have bailed, knowing he could never get the race line into the left hander.
Vettel got his justice.
In V8SC's, everyone that attempts Vettel's race line, knows full well it "always" ends in all wheel lockup and results in a crash.