I thought it was just a coincidence up until now that he's been involved in so many incidents.
But from this incident I think it's clear; The guy just lacks the awareness of the cars around him required to be able to race wheel to wheel at these sorts of speeds.
Peasantslayer hit the nail on the head:
We have almost come to expect an incident involving Grosjean whenever he qualifies well, Pastor seems to crash because he's aggressive so he could change, where as Grosjean seems to crash because he has very poor awareness.
You could compare him to his teammate Raikkonen, who probably has the most spacial awareness of any driver on the grid. Grosjean is a fast driver, and a good overtaker when it's straightforward. But on the first lap when it's a little more crowded he just can't navigate his way around the track without hitting someone.
I know the feeling from playing iRacing; sometimes it happens, whether it's a mistake on your part or just bad luck. But they're rookie mistakes, you're expected to filter those sort of mistakes out as you gain experience and improve your awareness. Over time you develop the foresight and awareness to keep yourself out of trouble.
It's a bit of a dilemma as to what to do. Spa was a dangerous one, hence the race ban. But can you seriously ban him because he
might do it again? I'm of the opinion that he will lose his drive all by himself if he continues, he doesn't need to have his superlicense revoked. The problem arises when you consider that someone could get injured or even killed by one of these rookie mistakes. I think consultation from the drivers is what is needed, as it comes down to a matter of safety. If the drivers feel that Grosjean's driving puts them at risk then he should be forced to walk away from the sport.
Personally I think a stern talking to is enough for now. But if he has a couple more minor first lap incidents, or one major one (That requires a safety car), he should recieve a multi-race ban. If he continues to do it for much longer he needs to be ousted from the sport on the grounds that he poses a risk to others.