"I think that the legitimacy of the court would be undermined in any case if the court made a decision based on its perception of public opinion"

This quote by Samuel Alito suggests that the court must not make decisions based on popular opinion, as this would weaken its legitimacy. Alito is indicating that the court must make choices based upon the law and the realities of the case, rather than on what the public may think. He is recommending that the court ought to remain impartial and independent, and not be swayed by popular opinion. This is necessary as it guarantees that the court is viewed as a fair and impartial institution, and that its decisions are respected and accepted by the public. By making decisions based on the law and the realities of the case, the court can preserve its authenticity and ensure that its choices are viewed as fair and just.