I found when I was doing IOP..That forgiveness was a huge topic. It is a key process in recovery and alot of people have alot of resentment to let go of in order to move forward. And it is also alot of the reasons why people use to begin with. It also gives people a chance to talk abotu underlying issues. I noticed people got stuff off their minds and got some advice as well.
And sometimes it just feels good to get things out. Like a huge release.
Just my 2 cents.