Well, active paedophiles tend to spend a lot of time justifying and defending, and, like all of us, can become highly convinced by their self-justifications.
I started hearing them when I first started work...and they are kind of startling...
I am now working with someone who also works with adult sex offenders, including lots of men who have sexually abused kids. It is actually fascinating to hear lots about about how they work with the cognitions of these people. They work a lot in groups, and the guys who have been in the group for a while do a lot of the work in challenging the new members.
We've been having some really interesting discussions about the role of porn in all this.