One of these things is not like the other. Plessy v.Ferguson was overturned, US v. Wong Kim Ark has not been overturned.
Yet.
Plessy v Ferguson p*ssed off far more people. The point still remains, if they are capable of Plessy, then whither their infallibility regarding Wong?
Wong might have even been a sop to their critics for Plessy. They certainly encountered a firestorm of criticism regarding that decision. The Wong court is now irrevocably tainted. You might as well say the Taney court rendered a decision with which you agreed.