Am I the only one who doesn't actually give a monkeys about this?
As a racing spectacle, Formula 1 is pretty much a dead loss. You can count the number of overtaking moves in a season on your fingers and toes. Personally I reckon that when a commentator has to talk up the speed or otherwise fo a pit stop as being crucial to a race result, you're looking at an engineering excersise rather than a proper exciting sport.
When the technical regs make overtaking so difficult, strategy becomes all important. I don't think Piquet's crash endangered anyone including himself. I do think it enabled Renault to win a race they deserved to win, but which they might not have done otherwise through some other unfortunate happenstance.
You can claim it's unsporting all you like- but Formula 1 is quitessentially unsporting, because the technical regs give such a massive advantage to the man with the best car, or the man who, through luck, gets the holeshot at the first corner. Given that, I think Renault had every right to do what they did. And now I hate Formula 1 even more than I did before. Cheers!