Just because the person involved was 'one of ours' does not mean that he has immunity from blame if he was acting in a reckless manner.
Note that I said 'if'.
I am not implying that he was. At the moment there seems to be no indication that a fault on the aircraft may not have caused the accident. However a loop commencing at low height in any aircraft does leave little room for error and may not be considered a wise choice for a public display.