I think I'll open a can of worms and expose another point of view. After all, I haven't had any anarchic demonstration near my house in a while.
Let's suppose that Piquet did actually crash on purpose. What's wrong with that? No, really, I'm serious. Is there any rule prohibiting you from crashing? The thing is, the safety car rule was idiotic from the beginning. Teams were aware that the rule change meant high gains and losses at random. Many people were complaining before Spain 2007. Although other reasons exist, the no pit under Safety Car rule has heavily influenced both championships in which it was endured.
Drivers used to delay following cars when pitting under SC right behind their teammates. FIA banned that. OK. Are you going to ban crashing if it benefits your teammate? So, everytime anybody crashes and his teammate is behind, why shouldn't we give him a two race ban?
Yet another point of view. In Canada 2007 Kubica actually crashed on purpose. BMW felt that 2nd place was threatened by Alonso in a longer second stint and thus decided to hand him a stop and go penalty (worth more than the one point by which Kimi won at the end of the year). Now Mario Theissen is withdrawing from Formula One before anybody knows. I've just now realised that Alonso had already served his penalty before that humongous crash but it doesn't matter: the argument is equally silly.