Yes Grosjean was on the racing line and he was in the clear but mostly on the start the inside of the corner is the quicker way to go. I can understand Grosjean going to the inside, however I cannot justify him not seeing Hamilton.
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He has tiny little mirrors in which you can' see much but Hamilon had Grosjean ahead ansd to his left and could see him coming the whole way. He has a responsibility to avoid contact he sees coming..The Frenchman was ahead of Louis. After initial contact..if you've watched frame by frame, Louis stays on the throttle for a long time when he should have had faster reactions and got onto his brakes...he didn't...he exacerbated the whole thing by pushing Grosjean.
I ain't down on Louis but this time he could have avoided the whole thing.
I think y'all are being very hard on Romain.
We know that La Source is a very tough corner. It was a bit of a crazy start as well with [Pastor] Maldonado leaving [early] and the Sauber [Kamui Kobayashi] smoking a lot.
"I did a mistake and I misjudged the gap with Lewis [Hamilton]. I was sure I was in front of him. So a small mistake made a big incident."
What I think is interesting is the reasoning by the stewards...
"The Stewards regard this as an extremely serious breach of the regulations which had the potential to cause injury to others. It eliminated leading championship contenders from the race......
The highlighted part shouldn't even enter into it.

To achieve anything, you must be prepared to dabble on the boundary of disaster.”
Sir Stirling Moss