Hypocrisy, Honesty and Heavenly Father

"Jesus heard that they had cast him out, and having found him He said, 'Do you believe in the Son of Man?' He answered, 'And who is He, Sir, that I may believe in Him?' Jesus said to him, 'You have seen Him, and it is He who is speaking to you.' He said, 'Lord, I believe', and he worshipped Him. Jesus said, 'For judgment I came into this world, that those who do not see may see, and those who see may become blind.' Some of the Pharisees near him heard these things, and said to Him, 'Are we also blind?' Jesus said to them, 'If you were blind, you would have no guilt, but now that you say, 'We see', your guilt remains.' " (John 9:35-41)
I have been thinking on this passage in relation to a claim that is often levelled at Christians and one which I've seen brought up increasingly now, particularly due to the very sad and shameful Ashley Madison scandal. (That scandal being that such a service even exists and that anyone signed up for it- not that people have now been caught at it. Briefly on this point- for anyone involved with it, God forgives and so must we. See 1 Samuel 11 and Psalms 51 and 1 John 1:9 for great reminders of God's grace and forgiveness, as well as His judgment.)
      Non-Christians are quick to point to such incidents and label Christians as hypocrites whenever they fail in keeping Jesus' commands, especially in such a public way. However, assuming Christians are honest in admitting their faults and struggles and faithful to confess them and repent of sins, I don't see such failures of Christians as hypocrisy necessarily.
It would be hypocritical if any Christian claimed to be perfect and no longer susceptible to falling to sins after receiving Christ. (Though as my father would often say, after receiving Christ as Savior, we need not sin anymore because of the power of The Holy Spirit working in us. That doesn't mean that we won't sin anymore necessarily- we obviously have examples of the New Testament Christians that sinned and were forgiven. See Peter for instance in Acts 10-11 and Galatians 2:1-14.) I think public sins like this just demonstrate the main realization that Christians must come to first in order to receive Christ's forgiveness and love- we are all sinners and we all need God to forgive us of our sins. He has done this through Jesus' death and Resurrection- it is available to us by faith. We must place all our faith in Jesus' work and receive it. (Thus, Matthew 5:48 and Leviticus 11:45 are fulfilled- we are declared righteous because of Jesus' righteousness- not our own. We must be perfect as God is perfect- but we can't do that on our own. Christ had to do it for us- and He saves us, not because of anything we have done, but because of His grace. See Titus 3:5 and Ephesians 2:8-10.)
   Yes, such fallings definitely weaken our witness for Jesus- but they need not defeat it. As I alluded to earlier, King David not only entertained such notions as the members of the Ashley Madison site, but he also acted upon them and committed adultery with Uriah's wife. On top of that, he had Uriah killed and then took Bathsheba as his wife. God sent Nathan the prophet to bring God's judgment to David- the baby wound up dying and David's family life was a wreck ever since then. But God still forgave David and David still got listed in the hall of faith in Hebrews 11- he was a still a "man after God's own heart".
       We may not have such failings in these matters of sexual immorality, but we are just as equally susceptible and guilty in other sin matters. (Romans 2:1-11 and James 2:10) But as God reminds us and invites us in Isaiah 1:18, though our sins be like scarlet, He will make them white as snow- if we will let Him. Praise God! His grace is greater than all our sins.