THIS is where I think you are wrong - it IS news to many. Law schools and the ABA are not doing anything to warn people who they darn well know should not be getting sucked into law school and wracking up unreasonable debt. The playing field is a lot more even for a teacher from Mid Cowpie State College vs University of Big State than it is for T4 vs T1 law schools. And the T4 law degree can still cost $100K - THAT is the big difference.
A tier 3/4 degree can provide that, it won't work out everytime and it might turn out miserably, the lower down the totem pole you go the more of a risk you are taking. This is not news or should be news to any tier 3/4 student, or tier 4 dental school, med school, nursing school, etc.