Why couldn’t RFK help the Lovings? Why did they need to go through the judicial system?

Robert Francis Kennedy was the attorney general at that time and therefore he could not directly help Mildred but he advised to contact the American Civil Liberties Union.

Explanation:

Mildred Loving was an African American woman and her husband Richard was a white, they got arrested and imprisoned for violating the anti-miscegenation law of Virginia, the 1924 Racial Integrity Act. Only a higher court could help the couple now and on advice of RFK, they approached ACLU. The  American Civil Liberties Union instantly decided to support the couple. It became a landmark Supreme Court case, Loving v. Virginia. The court unanimously held that state prohibitions on interracial marriage were unconstitutional-and proclaimed that the freedom to marry belonged to all citizens of America.

this question makes no sense dude