Humans killing humans? Humans have always been commentating on other humans based on their experiences. Humans need a lot of safety. Every country has his own army. Every country is always preparing weapons. Just because some country is preparing weapons, other countries also start doing it. So, the entire world is just in the process of saving themselves from themselves.
We have never come across any animal doing the same. They do eat other animals, but they do it for their stomach. And, not for hurting others. They inherently do not have any quality of hurting others. They never make assumptions that they would be hurt by someone in the future. We, human beings, prepare everything for future.
Humans have always been very weak and hence they need protection. Out of their own weakness, they have invented many things to make them stronger. Everything we see around is Human’s creation for getting rid of his weakness.

One of the most essential words to always think of are that we are living in a pretender society. But the people who are in power — politically, religiously, socially — are in power because civilization has not happened. A civilized world, a mature man, needs no nations — all those boundaries are false — needs no religions, because all those theologies are simple fictions.
The people who have been for thousands of years in power — the priests, the politicians, the super-rich, they have all the powers to prevent human evolution. But the best way to prevent it is to convince man, “You are already civilized,” to convince man, “You are already a human being. You need not go through a transformation, it is unnecessary.”
And man’s weakness is that knowing perfectly well there exists no such thing as civilization, there exists no such thing as human sensitivity, still he starts believing in all the lies that the politicians have been speaking, the priests have been preaching, the educationists have been teaching — because it seems simpler to just believe, you don’t have to do anything for it.
Humans Killing Humans with Great Sophistication
Adolf Hitler alone killed six million human beings, and killed with great sophistication. Science and technology have been used. Millions of Jews have been simply burned in gas chambers — within seconds thousands of people are nothing but smoke going out of the chimneys. He killed so many people that it was impossible to give each person the conventional grave.
Man has never been so poor — even beggars have graves, but he had killed so many people that to make graves for all of them…the whole of Germany would have become a graveyard. So he had deep ditches prepared, and people were simply thrown into the ditches and covered with mud. Before throwing their bodies in the ditches he destroyed even those dead peoples’ dignity.
Their clothes were taken away; their heads, their beards, their mustaches were shaved so you could not recognize the face of the person. Their heads were cut off; so you would find somewhere the head and somewhere the hand and somewhere the leg and somewhere the remaining parts of the body. And thousands of people — it was impossible to figure out who you were looking for.
It seems that on this earth we are doing only one thing: reproducing children because soldiers are needed, reproducing children because wars are needed. It seems man is nothing but a necessary instrument for more destruction, more wars.
You are not born with a conscience. You can watch small children: if they see an ant they will kill it. Do you think the small child has some conscience? Do you think the small child is a criminal, a murderer? No, nothing like that. It is just out of curiosity, he’s just exploring his world. He has entered into a new world, and he is exploring it.
But there is no question of conscience. He does not feel that when he has been beating a dog for no reason, the dog also feels pain. Children don’t have any conscience; they have only seeds. You will have to learn how to be silent, and how to listen to the still, small voice within.
Here is another beautifully explained article titled: The Journey of Being Human. This article also explains a lot on Humans killing humans.