U of Miami only has 36% employment rate after graduation. This isn’t a new phenomena having to do with the economy or legal market. Sounds like a pretty specific issue to that school. Research employment rates of the schools you’re interested in.
What kind of public interest law? If you want to specialize it a specific issue then it's worth also considering the centers and faculty research specialties. For example, Harvard has resources for religious discrimination and islamaphobia that is unique.
Since I am mentioning several professors and including references to their specific areas of research, I think I will err on the side of caution and include the footnotes. Thanks for all your inputs on this! This is the best forum ever!!