The captain on Lion air's flight 610, re-trimmed the aircraft through 21 MCAS activations. The first officer, who was given control of the aircraft, got 5 more. Although it is speculated that neither pilot executed the required stabilizer trim procedure, the report does not specifically state whether or not that procedure was actually run. Source
The captain on Ethiopia Airlines flight 302, tried engaging the auto-pilot, on the faulty side as well, and despite that being the first step for the procedure, to disengage, he tried multiple times to do otherwise, then skipped over the second step, which was to disengage auto throttles, this allowed their airspeed to build up around 390. I’m sure this didn’t help the nose down force, but ultimately, they re-engaged the system which allowed MCAS to drive the nose down further. Boeing's CEO stated these failures to follow procedures is what led to the crash. Source
The question, then, is this: if the crashes each resulted from pilot error, why is Boeing under so much scrutiny?