Through my line of work I regularly come into contact with the parents of sex offenders. Usually they are single women in their 60s-80s but every now and then they are men and even more rarely couples.
I'm usually there because the parent has become isolated as a result of allowing their male child, the offender, to live with them because nowhere and no one else will accommodate them after their prison service has been served.
Usually other family members will have disowned both when the mother chooses to 'take in' the male offender rather than maintain the relationship with other children. Often there is no choice about this if there are grandchildren involved and contact between them and the offender is prohibited, other family members will have received visits from children's services and had it made clear to them there must be no contact.
Often there is also some type of abuse occurring by their son, most often financial and verbal abuses but sometimes assaults as well. Most report that their son 'never used to be like this' and 'it's not their fault they can't get a job/ are depressed etc'.
The women nearly all say the same thing, that they love their son, they can't see them out on the streets no matter what their son does to them and what financial and social hardship they have to live in as a result.
Its horrible to witness and the justice system enables the abuse of these women as it's 'easier' than trying to reintegrate their sons elsewhere and is often a protective factor in reducing the risk from their son to others.
We don't get the opportunity to work with these women until it's usually too late and they are too far down the rabbit hole and can see no way back.
It's absolutely natural to continue to want to protect your offspring no matter what they have done, but if that's what you choose to do choose to do it from afar and with very clear boundaries in place around their access to your home.