You only have to look at the survey results to see what the vast majority of pilots think of this spectacle.
If this was practised in a sim then it does not say much for the supervision or competence of those thinking that this was a good idea. The blind leading the blind is more likely.
If the low turn was done on the day as a "good idea" I could fathom it more clearly, but either way the individual concerned should explain himself to the company insurers and then the public he put in danger at the event. And for what - a thrill for the pilot flying because the spectators would not have given a rat's ar*se if it had been done at several hundred feet.
Thanks for bringing it to the attention of the wider pilot body. Interesting to see that the few defenders are also the pilots countrymen. Can't criticise your solidarity there - misplaced though it is.