Folks need to consider how many aircraft come & go at Oshkosh (about 15,000 IIRC) and the statistical fatal accident rate of GA (about 1.4 fatal accidents/100,000 flight hours; about 6.7 accidents/100,000 flight hours). 15,000 planes flying from all over the US (and the world) to a point in Wisconsin. How many flight hours do you imagine were involved? I put 11 on the Mooney, and I was but one of ~15,000 aircraft, and I didn't come from all that far away as the general population of aircraft and their geographic distribution goes (most are in California, Texas, and Florida, IIRC). Putting the number of aircraft and the flight times involved together, it doesn't take a math wiz to realize the 100,000 flight hour mark will be crossed by the collective sum of aircraft going to Oshkosh, which puts a fatal accident in the relm of what statisticians call "a mathematical certainty", and accidents overall near (if not over) double digits. Given that crashes are binary events (either it is or it isn't--there is no 0.5 accident) and taking into account normal statistical variations, it isn't surprising at all that we had 2 fatal accidents this year.