the line was clear as day...in this story is full admission in scripture that sin is real...he acknowledges the woman has sinned, he guarantees that the crowd has sinned..and he is warning them from sinning again...you can twist this to mean all is forgivable or you can take it for what it is...god speaking with his own mouth that they were all sinners and needed to stop...he didn't say keep doing what you do he said stop all of it, not live as wish because you shall be forgiven