Perasonally didnt boo Nicki until the holta accident when Nicki was up and ready to have a go at holta until he realised his bike was damaged and was instantly shot by a sniper in the crowd and fell down like a sack of spuds.Think you will also find Nicki's tumbles as you so put it were just them sliding off but the Iversen/Harris crash was nasty and both riders got a big ovation for getting to there feet.
Don't disagree that Nicki took a tough fall in final but just proves that he made a meal of the Adams/perdersen incidents to make sure the mechanics got his bike ready,but im also not blinkered enough to think other riders do this aswell so maybe FIM need to look at it in more detail.