There is nothing wrong with eating carbohydrate per se. What is completely unacceptable is the development of hyperglycaemia. There may well be people who can live on a diet of yams and sweet potatoes without cardiovascular problems. I would suspect that the pre requisite is that insulin sensitivity must be such that they avoid hyperglycaemia. If they don't you end up back in to the realms of apoptosis, with your myocardial cells deciding they've had so much sugar they'd rather die than have more. They then vote with their "cytochrome c-activated caspase-3 pathway" (whatever that is: EDIT, okay I've read PSS now and have more of a clue!) and take this to its logical conclusion. Blood glucose levels of 22 mmol/l and 33 mmol/l are well within the reach of any diabetic taking the ADA dietary advice.
One of the best quotes I've ever heard was very second hand. It came from a poster on Dr Bernstein's forum who had tried to convert another type 2 diabetic to LC eating. The quote was from the LC refusenik:
"I'd rather die than eat bacon and eggs without hash browns"
So be it.