You certainly seem hell-bent on attributing the blame to the aircrew, M61A1.There have been plenty of high hour, well regarded pilots that made serious errors resulting the deaths of many.
What part of the Safety Bulletin after the first crash did you miss? You might be able to blame the first crash on lack of education by Boeing, but the Ethiopian crew had the information acted on it then undid their actions and crashed. The Comet problem resulted in aircraft falling apart mid-air, but if the MCAS syatem has a problem you turn the trim off it will fly just fine, how you can compare the two is beyond reason.
Has it occurred to you that in the short space of time before the crew turned off the servos, the aircraft may have already been so far out of trim as to render it impossible for the crew to recover? And that their re-engagement of the servos could well have been a last-ditch effort to re-trim faster?