I don't know MizO, I wasn't preaching the bible, but was describing a moral thread that runs through humanity predating the Biblical story of Cain & Abel.
The Code of Hammurabi was set down by the first ruler of the Babylonian empire ca. 1780 BCE.
The Egyptian tale of Osiris and his murder and dismemberment by Seth is even older-- probably ca. 2500 BCE. There is also the even older Sumerian Murder Of Dumuzi tale, from which all murder/resurrection stories may have been born.
So, it's not just a Judeo-Christian thing. And I am not a follower of either of those particular schools of belief, but...
In the biblical tale, Cain screams out, "Am I my brother's keeper?"
And the unspoken answer is, of course, "Yes!"
Your bit from the bible BTW about "judging" concerns something else indeed... and has nothing to do with murder, or judges in courtrooms.
That bit in Matthew: "Judge not, that ye be not judged. For with what judgment ye judge, ye shall be judged..." seems to be about hypocrisy.