Every so often someone posts a gentle hint that maybe these two pilots ignored all the warnings and apparently all common sense because they thought they could get away with it. Perhaps because they had done this before, and perhaps more than once. So far, there is no evidence that the bizarre series of events leading up to this crash was caused by anything other than the deliberate actions of the pilots, contrary to normal operating procedure and in spite of functioning controls and alarms. There is no end of evidence that this has happened to some degree before, but nothing quite like this. There must be some other explanation.