Suggesting someone was possibly too fatigued to properly operate the aircraft is accusing someone of professional negligence at least, isn't it? Possibly criminal negligence?
I don't think it's too different from reading a story about a murder investigation and idling throwing out 'could be Bob that did it - I hear he gets angry sometimes' without knowing Bob, knowing whether he usually gets angry or not, whether or not he was angry or not at the time, or whether anyone was angry at all in the situation or even if Bob had anything to do with it in the slightest.
I don't think it's too different from reading a story about a murder investigation and idling throwing out 'could be Bob that did it - I hear he gets angry sometimes' without knowing Bob, knowing whether he usually gets angry or not, whether or not he was angry or not at the time, or whether anyone was angry at all in the situation or even if Bob had anything to do with it in the slightest.