Delaney T, you are talking rubbish
You make various statements without backing them up with proof and/or statistics then finish off by stating "Wonder what the overall historical mishap rate is per actual 'airshow' hours flown worldwide ? Very high, IMO ... but those stats are not calculated anywhere."
If these stats are not calculated, how you can state categorically that "The statistical probability is high that this L-39 crash was pilot error".
How dare you make such an assumption only 2 days after such a tragic accident.