That's pathetic.
For me, that's the core problem.
Honestly, I really would reconsider reporting someone if I could be sued to desperation. On the other hand, if there are factual proofs?
Secondly, doctors stick to each other. It's not so important that a neurosurgeon cuts main arteries so that people bleed to death, it's more important that he gets a job and that the profession has a good reputation.
I can understand it. If a doctor can't do his job, it's over or he'll need to go back to education (which is expensive). It seems, though, the doctor's financial security is more important than the patients' life and financial security.
Maybe the only way is the criminal law - but not in Germany. The prosecution blocks nearly all criminal charges against the medical profession.
I think such an extreme case is not common. Still it makes you think twice in the future.