Again, David blames himself for what is happening to Nic, realizing how vicious his son’s addiction has already become. But there was no way for David to know what was happening to Nic at the time; his tendency to blame himself comes only with hindsight. Additionally, the idea that Nic can stay clean alone is quickly invalidated by his nearly immediate disappearance. This proves the importance of addicts getting necessary support from rehab programs, even if they don’t think they need it.