My department must have just sent out its graduate admissions decisions, because I've been getting emails from rejected applicants asking for an explanation of why they were not offered admission. I have no idea why I'm the one getting these emails (maybe such emails are being sent to all of my colleagues?). But the very idea of emailing a stranger and demanding an explanation of this kind of thing strikes me as inappropriate.
Anyway, here's my favorite of the bunch (only slightly modified):
I was shocked to receive word that I was not accepted into [your graduate program in Philosophy]. [Your school] was one of my "fall back" schools, and I expect to receive offers from many programs that I'd rank higher than [your department]. It seems to me that you should probably correct your admission process. No wonder [your department] hasn't produced a top-notch philosopher in quite some time.