The penalties for lewis (the massa one) and di resta I think were unnecessary as no cars were actually taken out of the race, just racers trying to pass other racers and the door is shut! And it was their cars that actually got damaged.
Did Schuey get penalised for running into the back of Hamilton, damaging hamiltons car? Nope.
But the final one for lewis i think was necessary as it ended maldanado's race. But Maldo could see lewis was attacking him as he was blocking him down the straight. So why he shut the door so heavily I don't know. When hamilton passed schuey there earlier in the race, schuey knew he was going to pass so gave him space rather than take them both out of the race. The mentality of some of the younger racers needs to be questioned if anything.
But I think the stewards were a bit harsh.
They even reprimanded Kobayashi for passing Suttil?! Whats that all about? are they not allowed to pass anymore?
Rediculous!
