The matter is not of rationalization, but of understanding the difference between people, and the choices people have made in their lives. That is what twists humanity. That is what destroys us, and those around us.
But, to rationalize it, I suppose, would take some effort to say that as time has passed, certain ways have been forgotten on how to respect and cherish one another, and that they have been replaced by greed and want, and sometimes people allow those feelings to overwhelm them with desires that are dishonorable, and they use them intentionally to please themselves. This becomes more apparent in the modern day times, even though it may or may not be emphasized as much.
But it would be those that stray from such ideas, and move towards restoring a better honor towards themselves and others that can, perhaps, change the world. At least by a fraction.