I think the difficulty was that it wasn't black and white. You can say "I think MCAS is a danger because it only relies on one sensor and has authority to make the plane uncontrollable" and someone can counter with "MCAS failing looks like and is fixed the same way as any runaway stabilizer trim, every pilot knows how to handle that".

Obviously the second hypothetical statement was wrong, but it's hardly "evil" to make that argument.