What about Grace?

So news broke out recently about the author of one of the greatest worship songs today, Healer. It turns out this guy says he doesn't have cancer as he had claimed. However he did have another addiction, pornography. Perhaps he did have cancer.
So some of us on a church staff are talking about this ordeal. One says, "there is no way we can ever sing that song again", my question is why not? Has the song lost it's power because the guy that "wrote" it was a liar. A question came up about airing a message from another speaker that had been caught in deceit. I say sure, air it, sing it, if it is good and inspiring and touches the heart of God.
I am reminded of David from the Bible, we quote him, we sing his songs, we deliver message series based on him don't we? Here is a guy that premeditated sexual relations with that woman and then charted a course for murder. HELLO!
And what about Jesus, when a woman was caught in adultery she was tossed at his feet thinking she was about to be raked over the coals by Jesus Himself. But what did Jesus do? You without sin, you throw the first stone at her.
I am challenged by all of this. First of all, who among us is without sin? All of us have sinned and fall well short of God's standard. But isn't that why Jesus came into the world? He came to redeem a sinful man, you and me. I know we as humans really like to rate all of our sins on a scale, some are much worse than others, does God see it that way?
After all, God has a message to get out, I thank God that some folks are willing to be used. I am grieved by "Christians" beating their own when they are down. Can we at the very least pray for his healing, reformation and restoration? I say as Christ followers, we are to be carriers of His love and grace and it covers ALL sin. Thank God!