
Chris E. answered 11/05/19
History and Writing Tutor with J.D. & M.A.
There's more that goes into sticking with precedent than adhering to what the previous justices ruled. Among other things, there are policy implications to consider as well as the impact on other constitutional issues dealing with similar topics.
For example, in San Antonio Independent School District v. Rodriguez the Supreme Court of the United States (SCOTUS) held that education is not a fundamental right guaranteed by the Constitution. The petitioners, local taxpayers with children attending local schools, cited in their complaint that offering children a low quality education harmed the societal interest of having an educated population for purposes of voting. Essentially, the parents tried to link education with the right to vote. SCOTUS did not agree and sided with the state.
If SCOTUS had agreed that having better quality schools was a fundamental right that created more educated people, and thus improved on the right to vote, then the court would have to consider other elements that impact the right to vote. What about providing good quality healthcare? Doesn't a voter need to be healthy to vote? If a voter is not given good quality healthcare, then shouldn't the state provide that service so that people may be healthy enough to vote?
These types of cases may lead some justices to conclude that it's better to side with the majority in one instance to avoid opening the door to future litigation that they may not wish to consider.