Over 300 people dead sounds pretty serious to me. It's probably safest to ground the plane model until we know more.
Generally do agree with grounding the Max 8 fleet as a precaution, and also given the poor engineering smell around the MCAS.
But not keen to assign blame/failure and damage reputations until there are credible investigation results, or without providing references.
It seems more likely that the plane suffers from some elemental design problems that were insufficiently patched over to pass inspection in order to protect the already invested capital.
They are just blaming the victims, trying to let those already killed pilots to take responibility for their faulty designs.