Niki, I agree that stage invasion may be too strong a term (it was me who said it, and I was exaggerating for effect).
I also agree - from my limited experience - that Mika crowds are polite in comparison to most. The friend I took to see Mika is a seasoned gig goer (unlike me) and she said the same.
However we can only go on what the people who experienced the crushing said, that it was very very frightening and they had to struggle to breathe, and the fact that this scenario was a direct result of Mika encouraging fans onto the stage I just think is not right.
And as Bab says, in this day and age there is so much health and safety stuff to consider, not to mention the threat of being sued should something terrible happen, so it still surprises me that Mika did it.