He was cleared by the stewards for Fuji so presumably wasn't guilty of anything and being helped back on the track has been done many times in the past - Schumacher famously being pushed out of the gravel by the marshals.
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Brogan - playing devil's advocate, you could also ask the question of why the stewards cleared him of any blame in the Fuji incident..... At the time, there were several drivers calling for his head!
(I'm also reminded of his quote -
“I just think it’s a real shame for the sport, Formula One’s supposed to be about hard, fair competition. That’s what I’ve tried to do this year, just be fair. There’s been some real strange situations this year where I’m made to look the bad person and, by the looks of it, this weekend be given a penalty.
“If this is the way it’s going to keep going it’s not somewhere I really want to be.”
- remember that this was before he had received a single penalty from the stewards all year)
Regarding Hamilton being craned onto the circuit again - there had never been an instance of a car receiving mechanical help to rejoin the track - personally, I believe that if you require any outside assistance, that should be the end of your race! (But that's just me)....
You ask the question of why the media centre would erupt? Well, I suspect the reasons are threefold.
i) His team-mate was Alonso. It was perceived (Rightly or wrongly) that Hamilton was getting preferential treatment within the McLaren team. The Spanish press didn't like this one bit.
ii) He was still racing Raikkonen in the Ferrari for the championship - Hamilton going off the track in China gave Ferrari the chance to win in Brazil
iii) There was a perception (Again, rightly or wrongly) that Hamilton's ego was bigger than his talent - he certainly had annoyed several of his fellow drivers with some of the comments during the year (Although this may well have been to do with ITV sticking a microphone under his nose the night before every single race!)