So? Given the right hand bent that the court seems to be about to take, they are right to bring these things up. Republicans seek to do the same things in stacking the SC. So in that respect the sides are no different. The difference here, is that Democrats seem to be worried about basic liberties and freedoms being taken away from people that don't fit the religious litmus test of the right wing. Or have precedent overturned because it offends their delicate sense of what they view the world should be. Republicans and conservatives have long used the courts and legislation to impose their rigid belief systems on the majority. So, good for Democrats.
There's this thing called "the pendulum ". The Court swings from conservative to progressive, back and forth, back and forth. Now, the progressives have decided they don't like the pendulum so plan on destroying it.