Boy, you just took that verse way way out of context. I expected far better from FR posters.
I don't have time for this, but here it goes.
Jesus knew he was being watched by those that wanted to report him and get him arrested. Jesus knew his time was not yet arrived for such.
Jesus knew the punishment for her crime was death and he was being challenged (he could not just walk away not saying anything, he was pressured over and over to give an answer). Christ also understood that the penalty for a Jew to prescribe the rightful penalty of death was also to receive a death penalty from the Romans who forbade Jews from giving the death penalty. So Jesus cleverly said the section you quoted. He did not change the law, he did not even give her a pass on her sin, he made it clear what she did was not ok and said go and sin no more. It was sin and as Jesus he had the power to forgive that sin. But in no way did Jesus even condemn the people for wanting justice.
No, he showed them as hypocrites, because they were all willing to stone this woman, yet they were all guilty of sin themselves. The woman just happened to be the one who got caught. At least one poster on this thread confessed that long ago he did exactly what this couple did. He just happened to not get caught.
I did not take the verse out of context.