EM&M,
You asked, "why in the world is it harder to get into med school?" First, I think you meant allopathic med school, since ostepathic programs are aslo med school. Anyhow, think of it this way, why is it harder to get into Harvard, or any of the Ivy's for that matter for undergrad education than say some random state university? Why do you have to be so much more competitive to get into any of those popular programs, why do they require higher GPA, and SAT's? At either place, prestigious universities or a state university, you can major in History and learn the exact same things, the results are the same right? You get a Bachelors degree at the end and the graduate from either institution will have learned the same history and will have passed similar tests which assessed the same information. Further, a bachelors for either is recognized in academic circle and in the job market as meeting educational requirements and therefore each student competent in the discipline. I think this analogy works well with thinking about MD vs. DO programs for medical school. Yes, they have the same curriculum + OMT for DO school, and at the end both are recognized as meeting the educational requirements by training students to be physicians. Just like any prestigious school, lots of student's want to get into them for the name, when in fact there are many other accredited institutions that are also very good programs, but they lack the prestige and instant status recognition associated with a "Harvard" or "MD" name or title. I hope you get my meaning.
Using this analogy, there have been lots of students who are really keen on the glory and prestige of getting into undergrad at one of those prestigious places, but in the end they just didn't get in and instead had to attend an institution that may still be great for it's education, but does not have the instant name recognition....so they may have always felt that people thought they were not smart enough to attend a Harvard or Ivy league, but I doubt many people actually think that way about them. Then there are others that never even considered which is more prestigious for undergrad, nor do they care, to them they simply wanted that degree in history and they knew that their local state U. could teach them and that the degree was fully recognized everywhere. So then down the road when the state U grad is working in a job that requires the history degree, no one will really care where they went to school nor will they care that they didn' t have to meet the rigorous academic statistics of a ultra competitive "Harvard" like school to have earned that degree knowledge and career.