It is part of avaition and has been since the beginning. That doesn't reduce the loss of life every time it happens. No matter the cause.
After all these years I have stopped counting. I think I shopped after my father died 8 years ago. IIRC at that time I could count 30 off the top of my head. And I tried then as I do now to learn something from every incident or accident.
It is our responsiblilty as pilots to learn from the mistakes of other and apply what we have learned in order to minimize the some occurance happening again.
My condolances to you and the family and friends of those lost.
Honestly, I think it will take a few more serious accidents to get the conversation started, but I agree completely with a minimum altitude for airshows. I wonder if some of the riskier maneuvers would even be possible without assistance from ground effects.
I read an article a year or so back where Sean Tucker said he used ground effect to aid in some things, but that he could do the same show without using it. In some European countries they have a minimum altitude of 50' if I remember correctly. Sean said the hardest part was re-learning the maneuvers to fly there because the US pilots use different reference points.