Your comment about low intelligence is incredibly rude and unnecessary. And yes, goady and twattish; not you, your remark.
I'm afraid you do come across as naive. Some people are evil, they do not function as we do, they have no thought for others, and they do commit simply appalling crimes for reasons that are beyond our comprehension. Whether they are born this way, or made is actually irrelevant, they are still people who will simply not care what impact they have on others. Most of us have met people like this, to a lesser extent. We are just very, very fortunate to have not met one who is more extreme, not become a victim of one.
People like that, you can offer as much help and support as you can, as this woman was, it will not change their nature, and our focus should be on safeguarding their potential victims.
I'm also pretty appalled that you refer to support workers as lowly. That's a disgusting think to say. As for feeling picked on, it's you, and a couple of other posters, who have singled posters out. This thread is not a personal thread, please stop making it so, and distracting from the real issue.