Yes, patients die under a doctors care all the time and as long there is no malpractice and the death is due to the disease or ailment or old age, the doctor continues to practice.If medical boards allow doctors to continue practicing after a number of deaths, then your point is completely valid and mine is invalid.
However, if medical boards kick out doctors from continuing to practice after committing malpractice, then the reverse is true.
Which is it?
No, a malpractice suit is not a reason to lose a medical license. If it were, there would be very few doctors left. Almost everybody gets sued over their lifetime, and many times the suits are settled for economic reasons, not because of malpractice. And even so, it takes a particularly egregious pattern of malpractice, which is a civil matter, for a license to be revoked. It becomes easier when there are criminal convictions involved. The loss of a medical license is the loss of a livelihood, and members of medical boards can be sued for that, so due process is followed assiduously.