Wait a minute... Im a doctor and I disagree with this.
> They put the students through hell because that's what they had to go through...
True. But the reason is that it toughens you up and winnows the wheat from the proverbial chaff. The forced marches through the wards at 2am in the morning prepare the budding doctor for the real world where he can be called upon as say, the sole doctor for miles in a rural area to attend to a mass casualty event.
>In most other countries, doctors don't have an accreditation board. ...
I do not know of any country that does not have an accreditation board. The difference between countries is the process of accreditation. Sometimes it is direct: the student takes centralized a board exam; sometimes indirect: the student takes a uni exam approved/supervised by the board.
> it doesn't require years of school to set a bone or put in some stitches
Maybe. But it requires erudition and experience to anticipate that a poorly set bone can heal with complications(malunion, non-union,infection etc.)
Fun fact: when Admiral Nelson was wounded in the battle of Santa Cruz de Tenerife in 1797 field surgeons had his arm amputated but mistakenly trapped his nerve in a ligature that caused him great pain until the mistake was corrected )
> it doesn't require years of school ...(to) diagnose the flu or pneumonia
That pov is exactly how people get misdiagnosed and killed (by quacks).
There are many different diseases that present alike and even subgroups of the same diseases that have different management regimes.
While it may seem obvious for instance, that a patient has pneumonia, one would also do well to ask what kind of pneumonia he has, why he has it (immunocompromise?, zoonosis?) and what the alternatives could be( the differential diagnosis). More than once has "ordinary pneumonia" been found to be lung cancer.
It takes years of post graduate training and practice to become proficient enough to identify different disease conditions and manage them with confidence.
Medical school hazing is not done because the seniors are sadists. Some aspects of the process could be improved but the rigor works and makes for good doctors.