Insofar as international law is observed it provides us with stability and order and with a means of predicting the behavior of those with whom we have reciprocal legal obligations.
Torture is such a slippery slope as soon as you allow a society or any legal system to do that almost instantly you get a situation where people are being tortured for very trivial reasons.
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I've always been driven by the concept of equal justice under the law but only the rich can pay great sums of money for legal assistance and that puts them at an advantage over the poor.