This is an interesting topic. Of course, you might weigh the OTD-ness of the person equally, but there are various ways that you might engage with people who are OTD, and different reasons that you might do it. Also, people are people, not characteristics. So it is obviously worthwhile to understand that there is a distinction between different situations.
For example, if the kid is a drug addict, it’s obvious that his parents beat him. If the kid is at Harvard, it’s obvious that the parents let him read inappropriate books.