Judging Not, Why Not, Why & So On...
Partly this is folk wisdom, something we intuitively recognize as the kind of balance we expect in a properly run universe. It's being presented in that light: "for whatever measure you deal out to others will be dealt to you in return."
One way this was explained to me: When Adam and Eve made that bad decision in the Garden... There was no criminal intent; they'd been incapable of knowing what they were doing or understanding the consequences. What the problem was, as Raymond Smullyan put it: "The fruit in question was poisonous and the effects last many generations."
We see the effect in operation right away; Adam and Eve discover that they're naked; and they try to hide. The next symptom, when God asks about it, is that Adam puts the blame on "The woman You gave me" (& shouldn't God have been more careful whom He introduced to him?), while Eve in turn blames the snake. It was simply not possible... for anyone to live in that state of mind, without eventually turning the same attitude towards themselves. Death is not a punishment, then; it has become as necessary for us as sleep.
And then Jesus comes along. He says "Judge not," and means it non-judgementally. He is proclaiming a no-fault, harm-reduction universe, for anyone willing to live in such a place.
And we fight the idea! It undermines everything human beings stand for! It's not fair! We've never lived that way; and we don't know how!
What was going on in the last show you watched, the last story you read? The last news you read or watched? Was somebody being bad? I can be pretty confident that someone was. It's hardly entertainment at all, without somebody milking our indignation somehow!
Could we give up judging, if we really wanted to? When anyone meets someone new-- They generally want to know, "Is this person likely to bite? Can I be sure it isn't?" Some people can't make that kind of evaluation: to recognize all the kinds of people who might do them serious harm, whether from malice, indifference or ineptitude-- and that's not a condition to envy.
But does trying to make those evaluations-- make anyone safer? A friend of mine, in jail for civil disobedience, started talking to the other prisoners-- and told me, afterwards, "I'd always been afraid of the wrong people."
Jesus was continually talking with those wrong people, but came to grief from all the "right" people.
Many suburban rattlesnakes in California... have degenerate, vestigial rattles. People have been disproportionally killing the ones whose rattles worked properly. So far, overall, the human success rate at assuring our own safety has not been good.
I'm leaving it up to God. Yeah, if I hear people outside sounding angry enough, like somebody could get hurt, I'll call the police. And pray, for everyone involved. It's not like I think it's a functional system I'm calling in...