I think we can agree that if Jeremy's speeding had been egocentric against the interests of God and man and he had broken his neck, any resulting disability would have er, been the result.
Nope - complete rubbish. His broken neck would have caused by him crashing the car, which might have occurred even if he weren't speeding and regardless of the reason why he was speeding. Alternatively he might not have crashed the car even though he was speeding (and being egocentric against the interests of God, in your words).
There is absolutely no justifiable claim that 'sin' caused his disability in this example.
And of course speeding is an entirely subjectively defined parameter - in other words, we as people, via the law define speed limits. It is hard to see how speeding, therefore, somehow fits the criteria for 'sin'.