In fact, there are many ways in which the death penalty is defective and should not be carried out In principle, the death penalty is moral and can become a legal judgment. They can support the death penalty if the crime committed is severe and individuals who commit a serious crime can not be recovered. As a rule of thumb, rehabilitation should be the first goal, but if you can not achieve this goal, that person is a threat to society and the death penalty is reasonable.
Not all societies are based on better concern. In some failed social experiments (think of Nazi Germany), strong men are "in it" for greater benefit. Social injustice is mainly caused by obedience. Nazi soldiers who were involved in the genocide of millions of Jews showed consistency as one of the biggest signs of the problem. When they were asked why they did what they did, they said, "We just obey the orders." It is very dangerous to spend your life without questioning authority, which is the main motivation for obedience.
When we think that things like slavery can bring greater benefit. Then, the prison of child laborers and debtors. This is the most difficult question - the bigger profit - is that we never allow solving the final solution problem. This approach depends on the end of progress and the beginning of retreat. Whenever someone thinks they have found an "answer" for the best interests - have you noticed it? - Then the age of darkness fell. The Soviets did it and immediately built Gulag. The Nazis did it, and soon the bomb fell. Assuming that we answered this question of greater concern, we have to go out and impose our will. Then all kinds of human foolishness will be possible
We all believe that our work in artificial intelligence brings human benefits. As Jobs said, we all want to "change the world" to gain more profit. But what are the bigger benefits? Happiness is a bigger benefit? In such a case, perhaps we may shoot ourselves in a psychedelic way and lead forever to virtual reality. The biggest problem here is the last question. Most of what we pay, poor are not other ways. Only a handful of people are fortunate to have all four of their lives (I think these people are in college years). Most of us waste our lives and have "BullShit Jobs". Perhaps this should be the real goal of artificial intelligence. Changing the world has made us all "reasons to live". In order to achieve this goal, we will not waste their lives and we will not sell "sugar water" to our children.