I would certainly concur with what Dr. Marshall is saying. It needs to be understood that if someone commits a sexual offence, it's not a sickness. It's not a disease process that happens with them. They're not born with something different about them that leads to that behaviour. It's a learned behaviour. Somewhere along the way in life, they learned to try to get their emotional and psychological needs met through that type of behaviour, and they choose to do so in the absence of skills or the awareness of how to do it differently. That's what treatment focuses on.
One of the current trends in treatment is sometimes referred to as the “good life model”, the idea being that if you teach someone how to lead a good life where their needs are well met, then you don't need to worry about them engaging in any criminogenic behaviour, not because they have the will not to, but because they just won't have the urge to.