You know I wonder if this issue arises with students going to Business/Grad/Med School. Is it only Law Students involved in this buffoonery?
With med school they always keep a minimum standard to ensure that everyone they admit is capable of being a good doctor (because even the person at the bottom of their class at med school will still be practicing medicine when they graduate), so I don't think there is as much of a debate about the skills of those admitted than with law school.
With business school work experience plays such an important role that, again, there is probably little debate about the ability of those who are accepted when it comes to being able to succeed in the business world.
And with grad school, many programs have open policies whereby they don't cap the number of people they accept, so often times you're only competing against yourself.
So to answer your question, I would say yes that this kind of bufoonery is probably more widespread among law school applicants. I mean, we are going into a profession notorious for its idiots (Jack Abramoff, et al).