The problem is, that even if he gets a prison sentence, what happens when he gets released at the end of it? He is still going to be a manchild sex pest. Plus, what happens when you have a fat, retarded, middle-aged man throwing temper tantrums when stores start banning him left and right due to management seeing a mother-rapist as being a liability around their clients, particularly children? I am not saying that Chris is a pedophile per se, just that word travels fast about sex crimes in most towns and many businesses might take a "better-safe-than-sorry" approach.
Also, I am not condoning this, but Chris might become a target for violent, anti-Chris vigilantes. Even if Chris does not end up on the SOR, a lot of people might assume he did or are so disgusted by what Chris did to Barbara, that they might take it upon themselves to physically assault or harass him beyond mere trolling...like fucking with his food at restaurants, taking and breaking his stuff in front of him, etc. The hostility and vitriol that many sex offenders face in their communities would be something that Chris would be unprepared for.