Alonso holding up Hamilton costing him an opportunity to do a fast lap is essentially or exactly what Schumacher did to Alonso at Monaco last year. Schumacher was penalized and put to the back of the grid.
Clearly, Alonso had help--you could see the guilty grins on the faces of the crew.
I'm quite sure Ron Dennis doesn't need any more controversy.
Is it possible for someone, other than Hamilton, to protest?