Like the other replies have said, pretty much every story thread in this game stays consistently important throughout, no stones stay unturned. However, I'll also add that people are allowed to process their experiences in their own ways, and are allowed to forgive and move on at their own pace, even if that pace is much faster than what we tend to think is normal. Should CJ be in therapy? Oh hell yeah, but is it wrong of him to forgive [character] so easily, and to fight for them afterward? No, that's entirely up to him.
On the flip side, it's also valid for their friends to have their own opinions and genuine reactions to what happened, but they still ultimately need to respect that CJ has accepted and forgiven [character] even if they haven't. If this happened in my friend group (and it has, unfortunately) I would expect everyone to react and process it in various ways, but I would also expect everyone to respect and validate the wishes of the victim. Now, this is obviously a story and it makes sense plotwise that the cast comes around to [character] which isn't how it usually pans out irl, but considering it's something that happened years ago and CJ was willing to forgive so openly I'm willing to suspend my disbelief there.