The key statement is, "... and they were able to induce my wife to click on one of the attachments." I'm not saying they couldn't have gotten control of the computer otherwise, but clicking on an email attachment seems to represent a leap forward in the enterprise.
We often take for granted just how much of our personal information resides on our computers. Whether we like being a set of numbers (or group of bits, if you will) or not, it is, now, what it is.
Something I think is significant is the hackers he invited used personal contact to ultimately gain access. What I hope that means is the simple precautions of not opening unknown attachments and emails works against randomly targeted attacks.