Boeing 737-800 crash in China

I just recently watched Downfall on Netflix and that news aint helping me feel all warm and fuzzy about their 737-800/Max 8 series.

Has to be some sort of mechanical failure if the plane is in a full nosedive, no? I mean even with engine failure from 29k ft you can glide ( somewhat - im sure you haveto pitch the nose down to get air speed then level off - repeat )

ugh.
I don't know if it's an accurate suggestion, but I wonder if the failure of the tail might cause a catastrophic nosedive. I recall that happening to an aircraft in the US several years ago, although I'm not recalling if it was a 737 or some other aircraft.