How would they know she was a married woman with kids and friends and supportive family?
They wouldn't, which is why they likely wouldn't just take a random woman off the street. Far easier to groom their victims - to look for disaffected teens, drug addicts, etc., who are grateful for a little attention, some kindness, some money or drugs, etc.; the person doing the grooming gets into their confidence and then, little by little he drops the kindness and starts to become more domineering and abusive. By then, she's totally under his control. They know how to work on the psyches of people who are vulnerable.