1/3 of all deaths are due to medical error

If 1/3 of all deaths are due to medical error (which is a low estimate), why is it that we trust doctors.

And why is it that the aging population is blamed for our economic woes.  A few decades ago it was the poor who accessed the social safety net who were blamed because they did not want to work. The next diameter to attack is our pets that should not be here as they have no quality of life. And then there is the 2019 case of Hannah Cement v. Ottawa Civil Hospital.  The Hospital got a court order to starve her, a 62-year-old woman to death, as she has dementia. How was that possible.