Not nearly enough evidence and not nearly enough supposed reform rate - and it’s highly debated by any thinker.
**Yes, obviously if they are underground or left to their own devices - they will choose their preferred method of sick enjoyment.

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**This is not a witch hunt, which implies persecution of a fictional nature. This man admitted he did it, was convicted for doing it, and what’s more it doesn’t appear he has any remorse. No indeed not. Rather he actually blames an 11 year old little girl for his disgusting mind and treatment of her.

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While I understand your obvious disgust at this man’s acts and no-one in their right thinking mind can defend these acts. I cannot and will not condone persecution of someone who has committed these kinds of crimes.
The man explains away his acts as someone else’s fault because he cannot face the total debase line he has crossed, his psychology simply cannot handle it. Every man and woman alive knows that to harm a child in any way is a line that once crossed they have entered a serious shift in psychology, they are not only disordered, they are also seriously psychologically damaged. They are therefore dangerous to children, period, no-one is disputing this; to coin a phrase they are ‘mad and bad’.
I don’t know if you have any training at all nor worked in this field, but studies have been conducted in efforts to reform offenders not to sympathise with them. These studies aren’t in place to make the offender feel comfortable, they are designed to reform them and that will make them most uncomfortable. So such studies aren’t to be sniffed at, they are working towards protecting children, not to simply make offenders feel good about themselves. The offender is supported for the very reason of reforming them so that they can be closely monitored and receive help so that they do not re-offend which in turn means children are safe.
These studies aren’t made up or plucked out of thin air, it is based on years of research and psychological profiling, of working closely with offenders and making every effort to find out what works and what does not work.
It is clear it does not work to leave offenders to their own devices, they will most likely re-offend. It is clear that driving offenders underground will lead to re-offending, so the awful situation is that someone has to help the person who is capable of harming children so that children are protected. Most child abusers have been abused themselves, that does not mean all people who have been abused as a child are child abusers, it simply means that the high proportion of child abusers have been abused. For those who abuse who have been abused they are carrying out learnt behaviour, their psychological constructs are inadequate, they are deeply inadequate and experience feelings of inadequacy, they believe themselves to be powerless and seek control and power, they show signs of multiple personalities, being charismatic and irrational, they are emotionally retarded for their age, they are emotionally damaged beyond recognising the humanity of another person, they are highly manipulative, they take advantage of people’s sense of compassion. etc etc.
Out of every ten children one of them has been abused as a child. This will give some indication of the magnitude of the problem, this will also put into perspective that most people who have been abused as a child do not go on to abuse children themselves.
It goes without saying that what this man has done is pure evil. But if children are to be protected in the future it does no good to say ‘string them up or drive them outta town’. People may like to know where offenders are in their community so that parents can take measures to protect their children, the OP has been lucky to have this opportunity, in my country it doesn’t exist, there is no way of knowing if a convicted sex offender lives in your community. However if people were to know this they cannot handle that information wrongly and it would be wrong to make this persons life a misery and cause them hardship where they cannot function in the community within the remits of their license. Further some people may even take the law into their own hands and more than this some people may well be violent.
I don’t think God would want us to take measures that are unreasonable. It is reasonable to keep children away from this person, it ia reasonable to report the husband and his ideas to the authorities however it is unreasonable to treat the offender badly.
In the Living Prayer of my life