webber didn't give enough room at istanbul then vettel crashed.
now heikki didn't give him room then he crashed..
it looks like karma, scary..
Heikki didn't give him room? He could have clearly gone left, as would be normal when the driver in front is defending the inside.
But instead Webber decided to try to use more slipstream right before the braking point and forgot/didn't realise that the Lotus has to brake earlier than him.
Heikki didn't help weaving a little bit (due to his own uncertainty about where Webber was going) but there was no reason why Webber needed to get so close to the Lotus and slipstream right before the braking point.
It was mostly stupidity from Webber as far as I can see, same as Vettel.
Its actually a fairly common incident when playing racing games online such as GT5

, people misjudge their speed differences and forget to take into account different braking points all the time while trying to be close and clever with their slipstreaming. Its basic racing knowledge to always give the guy in front some room and never to assume he is going to brake the same time as you - particularly a driver or car that is obviously slower like in this case.
Both incidents are the same, but you are blaming the wrong drivers. Though certainly this incident is a bit more even blame for Heikki with the unecessary weaving. But Heikki was perfectly within his right to defend the position - I completely disagree with those who think the slower teams should throw themselves out of the way just becaues in the long term they can't win. If you are racing for position, you are racing. There is no dishonour in forcing the faster car to have to work to overtake, there is perhaps if you do it the whole race and lose your own race with your nearest competitors (like if Heikki lost time fighting the Virgins or whatever). But Heikki wasn't making it hard for Mark - there was space to go around and Mark would probably have finished the job around the outside or later.
Basically - a backmarker driver should never do a Bernoldi but they should also be allowed to race for position, otherwise, whats the point in turning up?