So clearly you don't know what mob rule is.
The constitution isn't living and breathing. Meaning, citizens shouldn't be allowed (especially the Supreme Court) to change what is explicitly and implicitly stated in the constitution.
The constitution allowed for slavery and denied women's suffrage in that it wasn't explicitly stated. However, if you read the document, it's 100% implicit that denying civil liberties goes against the constitution. I don't think even you would argue this. So, when the Supreme Court fixed these historical injustices, they weren't taking liberties and changing the constitution, they were actually enforcing it... regardless of the mob (majority of citizens) who disagreed with those civil liberties.