> 50 years of widespread C usage has shown that just trying writing without errors using C doesn't work.

Millions upon millions of C code, over decades, controlled (and still control) things around you that would kill you, or similar catastrophic failure. Cars, microwaves, industrial machinery, munitions, aircraft systems ... with so few errors attributable to C that I can only think of one prominent example.

So sure, you can get bugs written in C. In practice, the development process is more important to fault-reduction than the language chosen. And yes, I speak from a place of experience, having spent considerable parts of my career in embedded systems.