Are people, in general, inherently evil or inherently good? If we are inherently evil, that would mean that the vast majority of us have been taught to respect life. Then it would be the fault of society for not teaching these murderers properly. However, if we are inherently good, and we value life because it is something from within us that tells us to value life, then those who kill are seriously ill or have been trained to the point that they can go against what their conscience tells them is right. I have no idea if either of these is true completely, or if the truth lies somewhere in the middle.
The extremely huge vast majority of people do not commit crimes against another person.
Does that answer your question?