Just went through the race again and when talking about flags, Ferrari and Alonso in particular have something to explain:
We can agree that you can't push to the max when there's yellow flags out, to ensure the safety of the marshalls. Alonso though failed to brake properly on the beginning of lap 5 under flashing yellow and he took the escape route with quite some speed.
In lap 56, Alonso almost lost the car at the exit of turn 3, again under yellow because marshalls were clearing the car of Hamilton.
So in my opinion, Alonso pushed too hard and wasn't respecting the yellow flags at all, and should be penalized for that.
So if Ferrari demand explanation, they should give some explanation too!