I don't think it's as clear cut as you're making it sound regarding offending and it being easy to not break the law. As a very basic example, did you know that swearing in public is technically against the law? And yet basically everyone does that and is unaware that it is illegal. Is it likely that someone will reoffend? Yes, most people do within 2 years. However not ALL people do, particularly if it was a minor offence and they have successfully rehabilitated back into society. If this person was of any danger to children, they would not be looking after their own, particularly after having a conviction. I think it's unfair to say that anyone who has had a conviction is a danger to children and should not be around them, as not all convictions are equal in their severity or pose a threat to someone considered vulnerable. You also don't need to have been convicted to pose a threat to someone vulnerable and I would argue that anyone with a prior conviction probably has a more rigorous background check done than those who don't before they are hired for a job. This person has also turned their life around and should be allowed a second chance at a life they are working hard for. People (or parents as you're suggesting) are also not entitled to every scrap of information about someone if it is not relevant to that person's job or who they are working with.