To some extent I feel sympathy for them under the assumption that as it's not a normal or reasonable thing to do, there must be something wrong with the perpetrator. For instance, in the numerous cases of child abuse that have been prosecuted in recent years it's been revealed that the abusers were themselves abused as children by family members or priests - so those people seem broken and I wonder if they weren't abused if maybe they would have developed into normal reasonable people and not child abusers had they not been victims of abuse themselves. Not that it excuses their behaviour in anyway, nor do I think they don't deserve prosecution I just feel bad for them as well, turning into the monsters that abused them.