Is that why they shot an innocent Brazilian, because of their high quality of training?
While the biggest failure the SAS had during the Iranian Embassy incident was their failure to kill one of the terrorists but instead capturing him
There were many failures during the Embassy Seige, but comparing this situation to that one is pointless - they are completely different.
The SAS primarily act as an agressive force not a police force. They do a small amount of snatch raids but they can take months waiting for the intelligence to come in. If it was a simple case of "he's in Northumberland go and get him lads" surely they would have applied the same mystical abilities to the bora bora mountains...
JCdM was shot by mistake - it happens. Tragic though it is mistakes do happen. All training does is reduce the likelihood, it does not prevent them from happening.
From what I recall of the testimonials, the officers did not shoot him by mistake per se, the controllers provided the officers with the wrong information.