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The Sin of One Person
Consider the effect of the sin of one person on others and you will realise that here we are talking of a person who chooses definitively to go against God. This person could be like the rich man in Jesus' parable of the rich man and Lazarus (Luke 16: 19-31). Imagine what it would be like for a person to be totally closed off from God's love. When you use your imagination to reflect on this situation with modern-day counterparts and based on the current century's sad history of sin, violence, genocide, and injustice, you will realise that things haven't changed much since Jesus' time.
It is not that easy to think of what goes on in such a person's mind when one decides to take on God and go against him directly. Does one really realise the enormity of one's actions? I think that to sin against God you must really be stooping so low in your life that you cannot distinguish the difference between good and evil, right and wrong.
If you will have have made yourself insensitive to this interior balance, you will have become an "evil" machine that reacts like a human being that does what "it" likes and feels it wants to do, instead of the conscientious human being that God created so that He can shower His blessings and love over His creation. In the Lazarus/rich man parable, the rich man has become everything that is despicable, a greedy, rich and unfeeling person who is unable to see favour in other beings. To him they are probably all equivalent to dogs. I just read of one of my countrymen who was arrested for keeping East European girls as sex slaves to be used for prostitution. He had lost the dignity of calling himself a human being in the way he reacted with other God-creatures.
Taking the modern image to this parable a little further we can also see how some political leaders can become dictators when they lose all sense of their leadership including their sensitivity to their subjects by imposing their own will on them. And by not respecting that of their subjects as well. They see themselves as Gods and their subjects as no better than dogs. History is littered with similar figures... Hitler, Amine, Hussein, and Gaddafi being recent additions from our lifetime.
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I concluded that when a person is able to become something like any of the above examples then one will have lost all of one's humanity. And becomes no better than an animal. We may know people in these circumstances and perhaps try to ignore their plight by persuading ourselves that it is not our business to interfere. But isn't that like compounding the error?
I think....that is what sin does to you. The march of the sin of one that rampages on....inexorably.