Look at it this way. If laws were not decided upon equally and justly, but instead subjectively based on personal opinion and 'fairness', who would get the short end of the stick in the long run? Once you allow unequal punishment once where does it stop? In 1787 it was decided that all men are created equal but due to subjective reasoning, that did not apply to all men. I'll ask again, should younger people be sentenced to longer terms because they have more life left to live?