I think there are too little pieces of evidence to post "theories" which could rapidly end in the high quality newspapers we have in the region. Heroes or zeros, at that time the crew and their relatives deserves some respect.
How many investigations would end up as a whitewash if people couldn't speak freely about them ?
The investigations I worked on, involved speaking with as many people as possible and begging them to speculate as to the cause, If people had been unwilling to offer theories and speculate then the hard evidence alone would never be enough to come to any meaningful conclusion.
Speculation makes you examine the evidence again. Political correctness has no place in a science.