By the time you're reading this, the FIA will have held its disciplinary hearing for the seven Formula 1 teams that withdrew from the American Grand Prix. A bit like being disciplined for being an innocent bystander to a 'crime' committed by the judge.
The root cause was of course Michelin's doing and they can stand accused of technical error. Any more than that is wholly against the very ethic of racing, like disciplining a driver for a failed passing manoeuvre.
We're dealing with competitors here. The reason the Michelin tyre wasn't suitable for the loads imposed by the banked Turn 13 was because of how it adapted its design pre-season to retain performance in the new one-set-per-race regs. Having to go harder on compound to make the tyre last, it sought to claw back the grip from a yet more flexible sidewall and it was this universal construction that was the problem at Indy, regardless of compound. With hindsight, the design wasn't modelled properly for the demands of Turn 13, but that's a misjudgement, not a crime. Like the driver who leaves his braking too late trying to overtake.
As for disciplining the teams for withdrawing, what serious alternative did they have? Max Mosley says there were two options, which the teams chose not to take. One was to run at a Michelin-restricted speed on the banking, up high out of the way.