To be fair, I don't think doctors intentionally try to kill or misdiagnose people out of malice, however formal medical schools have major funding by pharmaceutical companies so it may be a catch 22.
Personally, I think the key is getting to know your doctor very well, research your symptoms and present your doctor with evidence of your condition. 3 doctors, 3 opinions. Finding a doctor you like is similar to finding a good hairstylist.