DEUT969 Do not take pity on someone who murders or maims his fellow Jew. If violence against one's fellow man goes unpunished, and we fail to rid ourselves of destructive, evil and aggressive people, we will live in fear and society will be unable to function. As is taught (Avos 3:2), “A man will swallow his neighbor alive.” Unless the fools know that they will be punished for their crimes, they will wreak havoc and make a normal life impossible.