Why buy a GoPro if you aren't going to use it? Using video cameras is normal behavior.
For instance, a couple of years ago, a guy kayaking in Florida videoed his rescue of a traumatized dog who swam up to his boat. Video cameras are small and cheap. So, he figured, why not video all his kayak trips?
In Russia, traffic conditions and laws are so chaotic that folks routinely run cameras in their cars all the time, just in case. Check 'em out.
Ho many people do you know who even have 2 GoPro’s, much less have them with them and already videotaping passengers with one of them when the plane’s warning horn goes off? How many people carry waterproof mouthpieces with them in their armpack so they can attach the mouthpiece to their life jacket once they’ve got it on?
It’s a perfect example of conspiratorial “logic”. If nobody on the plane had taken a video, they would say it was “convenient” that they had no video to analyze. Since they do have video, but it just doesn’t show what they want to see, then it’s “convenient” that this guy had video cameras with him.
Any way the wind blows...