Actually, I have to ask why are addicts to be treated differently than a church member who has an affair? And what kind of sins of omission are you referring to? Giving the addict license to continue with their addiction, is enabling the addict to continue in their sinful behavior.

Properly exercising church discipline would not differ from a rehab center kicking an alcoholic or drug addict out for using while in the program. In rehab, the addict IS held accountable by staff, their families and peers for their behavior. Why would the church consider doing anything less for its membership?
Thanks for your thoughts, Gail!
I'm not really saying that license should be given to addicts. I'm just throwing the question out to see if any think that our approach to them ought to have some difference to it. The goal is restoration, not removal, right?
For the guy who has an affair, are you meaning someone who happens to have an affair one evening, or someone who pursues this course of life. David comes to mind as one who had one for a year.
For omission, just think of anything that we ought to be doing that we don't do. Let's say "loving our enemies and praying for them" or "doing unto others what you would want done unto you" or "letting only words that give grace to those that hear proceed from your mouth" or "thinking on only what is true, honorable, just, pure, lovely, commendable, excellent, worthy of praise" or "giving thanks in all circumstances" or "continuing steadfastly in prayer" or "letting your speech always be gracious, seasoned with salt". Now, if anyone is in the habit of not doing these things, shouldn't he be under church discipline as much as someone who is doing what he should not be doing? If discipline is administered because of sinful behavior, then both committed sin and omitted sin ought to be dealt with, right? For, both are sin. I wonder how many believers are in churches who are addicted to not doing what they should be doing?
Blessings!