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other wise we would be like animals, though often some animals display such ethical values. most do not kill each other, they share rather than steal from each other. so what we call ethics is more or less common sense.
Think about this more deeply. In many ways humans are animlas still. We are eductaed but most of us tend to hold things towards us. We form groups everwhere and one such group is a religious sect to which we belong...Christianity, Islam, Sikhism, Buddhism etc., and even groups within or about these. And this applies to to certain disciplines: science, philosophy, art and the various branches and differences. This is animal behaviour in a way. Like you say ethics is more common sense and if the truth is known largely this is true. Its basically protecting your own and this is animal behaviour. I would say one way to stop this is to actually protect and respect equally those who are not your own. Very few humans, if any, can say they can truly do this.
Can they and will they? I'm doubtful sadly.
But the question still needs to be asked: how? Plot some ideas down, probably they will be rubbish, but by joining good bits of each post there may be some consensus between most. Ironically this is one example of how we could go about solving such problems!