Helen Reece from the LSE just explained very patiently why we shouldn't group sex offenders together when deciding who can adopt and foster children. She feels it's wrong.
She used the example of a man who had sex with a 15 yo when he was 29. apparently the poor love should be able to have access to children.
She also talked about how cohabitting couples pose a risk to children (in order to say that they shouldn't be lumped together as a group) and now my head is about to explode.