Because medical schools do everything in their power nowadays to keep someone in and get them to graduate. You have the wrong analogy as well, MCAT is extraord

Because medical schools do everything in their power nowadays to keep someone in and get them to graduate. You have the wrong analogy as well, MCAT is extraordinarily thorough, so instead of evaluating on someone's high school GPA, it would be like evaluating them on an all-day entrance interview on which you evaluate them on their knowledge of software engineering, hardware, various programming languages, and their libraries. And many questions from TAoCP.