We also have to keep in mind that these are high performance aircraft that can be very unforgiving.
The other 2 events were the loss of a P-51 in Camarillo a few weeks back, killing the pilot. Then the same weekend as the Dayton crash, 2 P-51s came together during landing at OshKosh, killing one of the pilots. I believe the day of the crash at Osh was also the day that the 2 news choppers in Phoenix came together and killed 4. Thank god July is over...