The act of killing crosses a psychological threshold that cannot be undone. An individual may be quite capable of extreme violence, engaging in all manner of physical conflicts, and yet the act of actually killing another human being is a psychological event outside of that mindset. It may be easy to imagine killing someone in self-defense, or to eliminate someone whose behavior is considered especially heinous. Yet, we tend to imagine such situations where we become angry, or by assuming that there is some emotional element that will push us to such an act. The notion of being emotionally disconnected and still kill is something that is beyond most people’s ability to comprehend.
What is important to note is that, these are situations in which killing is not merely condoned, but expected. It has the full approval of the social group and yet it still creates numerous psychological problems for those that engage in such activities.
There fore “Karma” is actually your own conscience struggling to absorb what you have done, rationalization.
On anger, it is also another mechanism you need to protect yourself, us it to fight and live, rationalize later, get scared later.
Rationalization is a process of not perceiving reality, but of attempting to make reality fit one’s emotions.”
― Ayn Rand
It is the human’s self defense mechanism, but the only way to cope.