Rest in Peace Renny

I've go to say these accidents scare the crap out of me.
How can this happen? Renny flew so much he was almost a professional glider pilot. And yet he goes in landing at his home airport.
How can this happen?
Is glider flying really THAT dangerous and unpredictable?
I don't feel that way but accidents like this make me pause and wonder WTF are we doing? and why?
It's suppose to be fun this soaring and this is not fun.
Renny and so many others will be greatly missed....
So Tragic, this accident.