[williamscales]

I agree that it seems suspicious and this sort of weapon has loomed as a likely culprit from early on. There are very good reasons why someone would carry this out.

That said, I feel it would be irresponsible to deny the possibility of a collective delusion. Particularly in an environment where folks are in constant close contact and under a feeling of stress. In my opinion, it's less than highly unlikely.

[matt4077]

I would believe diplomats would be somewhat resistant against mass delusion, considering their selection (and possibly training).

Mass delusion has also been one of the leading hypothesis from the very first story on this phenomenon. Being aware of the concept would tend to dispel it, which apparently did not happen.

I'm sure those with more information have considered that possibility. The ongoing investigation leads me to believe they are not quite as sure of it as the HN crowd is. Maybe some of the cases appeared independently?