Looking at it from all angles, it's very difficult to pin the post-race crash on either driver. Vettel was on the right moving left and Stroll on the left moving right. Both drivers were on the marbles, picking up rubber for the post-race weigh-in and neither accounted for the movements of the other...
... but...
... all drivers know that after the race they drive over the marbles to pick up rubber. All drivers know this means erratic movements. All drivers know where the cars' blind spots are. Vettel hung back as Stroll turned in left to turn 5 and put himself in a position where Stroll perhaps couldn't see him clearly other than to know he was back there somewhere, then chose to pass him (perhaps thinking Stroll had slowed to let him). Unfortunately he chose the exact moment to take a racing line through the corner and squeeze left that Stroll decided to move off the racing line and go to the marbles on the right.
Stroll's still a rookie, but he's probably been in F1 long enough now not to behave in such an inexperienced manner. Nevertheless, you'd expect a four-time world champion with a decade of experience not to make the same kind of lapse of concentration - and as the following car it is kind of up to him a little more to make sure he can be seen in situations like that (and it's not exactly the first time this season he's lost track of his position relative to another car under non-racing conditions). But both can feel a little aggrieved by the other.
Maybe it's time for the FIA to introduce a fixed position cool-down lap with no overtaking. After all, there are usually excited marshals on the track waving all the flags...
At least the F1 deities ignored Max for a race though.
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