Although the U.S Supreme Court consists of men and women, whites, blacks, and Latinos, Catholics and Jews, it is also very non-diverse. All nine of the U.S Supreme Court justices attended either Harvard or Yale law school (Ruth Bader Ginsburg transferred from Harvard to Columbia).
This means that what were probably the most formative years in the justices' legal careers were all spent at the same institutions.
It's a bit of stretch to say that highly intelligent 22-25 year olds were brainwashed by their law schools. They had their lives' formative years before they showed up at law school.
Sotomayor has commented quite a bit in that regard.
This means that what were probably the most formative years in the justices' legal careers were all spent at the same institutions.