Seem to? I'd say overtly and in your face to the American people. Definitely, they have way overstepped the bounds proscribed for them in the Constitution (which is why they want to disregard it). Power hungry people will do anything to garner more power to themselves.
Reining in SCOTUS would be the first thing I would do if I were elected President.
I think the best/easiest way to reign them in would be to make them lay in the beds they've made (or allowed Congress to). -- apply Kelo to them personally: instruct gov't officials to make up some value for their homes (and all physical property) and seize it via eminent domain.
-- NDAA, throw them into confinement bread & water and some private to fetch them law-books and writing utensils.
and so forth.
See how quick they change their tune when the laws are used to cut them personally.
My question is about the existing legal mechanisms for “ we, the people” to remove a SC justice when his/her ruling violates The US Constitution?