I believe it to be the original intention of the founding fathers to allow one vote to determine the direction of a decision. When interpretation of a law is easily done, that matter never makes it to the Supreme Court where a 9-0 vote would be anticipated.
It's the difficult decisions that the supreme's accept to hear. Each one of the jurists arrives to the court with a body of experience and a belief in how to interpret the constitution, and they vary in their opinions accordingly.
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