This is the kind of thing that eats at me about riding. Whenever there are motorcycle accidents you can usually point to rider error: riding beyond abilities, no helmet, drunk, speeding or otherwise being stupid. I get stuck thinking that if I just watch myself all the time that nothing will happen to me.
But when it's someone like this, who you KNOW was ATGATT, focused, not hot-doggin, sober, and has hundreds of thousands of miles of experience you can't explain it.
I think of it this way. What better way to go than while doing something you love?
DL650A K7 - "Chewy"
08 WR250R - "Grover"