There is a big difference between feeling that something is right and justifying why something is right. Most people, regardless of their worldview, believe that murder is wrong. However, how do people justify that murder is wrong? Some people may argue that murder is wrong because we feel that it is wrong. These people are implicitly asserting that moral principles are subjective. In other words, they are asserting that moral principles are opinions or, in the best-case scenario, human conventions. The problem with such a stance is that different people may hold different opinions on the value of human life. For instance, the Nazis believed that the lives of the Jews were less valuable than the lives of other human beings. The Nazis were consistent with their own moral conventions when they proceeded to organize the mass murder of millions of civilians. How can we prove that they were wrong if we believe that right and wrong are just feelings? We probably feel that they were wrong, but they could have argued that they felt that they were right. It follows that when moral principles are nothing but social conventions, human life has no intrinsic value. When moral principles are simply social conventions, human rights are alienable rights that are bestowed upon the citizen by the state. Hence, the state has the power to deprive its citizens of these rights. Other people may argue that murder is wrong because it is detrimental for our species. However, what makes what is detrimental for our species wrong? Our species destroys the planet and has caused the extinction of countless other species. We must not confuse what is in our best interest with what is right. Finally, someone may posit that murder is wrong because evolution has programmed our brain to believe that murder is wrong. Nevertheless, this position, instead of proving that murder is wrong, proves that murder is actually not wrong, since if this position were the right one, morality would be nothing but a self-delusion, an instinct with which rational beings are not forced to comply. It seems to me that only the existence of God provides a sound foundation for our moral principles. An eternal and fair judge, who can reward us or punish us even beyond the grave, is the only true justification for the existence of firm moral principles. What do you think?