Never interfere with an enemy when….. they are making a mistake.
Even though the FF was in NZ (a 5 eyes country), you wouldn't think the Patriots would allow for people to be killed to prove a point if they could stop the event.
If allowing them to go through with it, Q may have been allowing them to pull another false attack (think McCain and Mouaz Moustafa fake chem attack) in order to catch them red handed.
The same person in the picture was also practicing during the mock mosque shooting:
(video in tweet)
https://twitter.com/TRepublicus/status/1107765615635374080