Absent evidence to the contrary, this kind of implicit allegation is close to libel
There is no liability for defamation of the deceased. At least not in English Common Law. Whether comments are in good taste is another matter. But the constant refrain from some pilots to stop speculation on this line of enquiry is just silly. You cannot ignore that which is staring you in the face. I will not repeat the arguments which have been made hundreds of times on this forum, but if this was a deliberate act, whoever did it went out of their way to make it very difficult ever to be found. Without that unexpected 'ping' we would still be looking in the South China Sea, and the sleepy heads in the RMAF may never have been caught napping. Incidentally, some have assumed that the RMAF Air Defence Radar is antiquated. That is not true. The Kuantan and Butterworth stations were upgraded in 2005 at a cost of RM$43 million. Since the same contractor provides SSR for ATC I would be surprised if they did not have he ability to track civil aircraft on transponders or notice when one went covert. Their buzzers must have been turned down too.