There is no excuse to kill a person with intent. This amounts to taking the law in one’s hand. Killing can be possible only in special circumstances when there is just the choice of killing or being killed.
However, there are cases in which murder is committed because of the loss of temper, which starts in a violent argument ending in a fatal action.
Killing for some is a matter of survival, when it comes to preserving a passionate relationship and the victim is seen as a threat to it. It can be due to feud between gangs etc.
But when the law is strong and society is nurtured with the principle to respect life, the chances of murder become extremely rare. There are two countries that are in sharp contrast: Japan and South Africa. In Japan, there is one of the biggest rates of suicide but very rare cases of murder. In South Africa, it is estimated that about 30,000 are killed every year. So the more murder there is, the more desire for revenge. It’s a vicious circle.
When the law and justice are well carried out, people can feel safe and the risk of killing or being killed will be very minimal.
Here is a poem by Robert Frost : “Fire and Ice“, which sums up the drive to kill, namely hate which can be the cause of fatal revenge.
Some say the world will end in fire,
Some say in ice.
From what I’ve tasted of desire
I hold with those who favor fire.
But if it had to perish twice,
I think I know enough of hate
To say that for destruction ice
Is also great
And would suffice.