I would like to quote someone smarter than me.

"Any law that degrades human personality is unjust. All segregation statutes are unjust because segregation distorts the soul and damages the personality. It gives the segregator a false sense of superiority and the segregated a
false sense of inferiority. To use the words of Martin Buber, the great Jewish philosopher, segregation substitutes an "I - it"
relationship for the "I - thou" relationship and ends up relegating persons to the status of things. So segregation is not only politically, economically, and sociologically unsound, but it is morally wrong and sinful. Paul Tillich has said that sin is
separation. Isn't segregation an existential expression of man's tragic separation, an expression of his awful estrangement, his
terrible sinfulness? So I can urge men to obey the 1954 decision of the Supreme Court because it is morally right, and I can urge
them to disobey segregation ordinances because they are morally wrong.

"Let us turn to a more concrete example of just and unjust laws. An unjust law is a code that a majority inflicts on a minority that
is not binding on itself. This is difference made legal. On the other hand, a just law is a code that a majority compels a minority to follow, and that it is willing to follow itself. This is sameness made legal.

"Let me give another explanation. An unjust law is a code inflicted upon a minority which that minority had no part in enacting or creating because it did not have the unhampered right to vote."