Assuming this theory is wrong (and I assume it is) it is interesting to consider why it has become so popular. Firstly, there is no compelling counter-theory. The consensus view (the plane turned off its flight path for an unknown reason, flew in a mostly unknown direction for an unknown period of time and then crashed somewhere in the Indian ocean) has so many thing that are unknown that any theory offering certaint…
The incident runs counter to the carefully managed, or at least well understood framing that people apply to the world at large through their lived experience, so seeking a 'human' explanation is somehow more comforting.