Well Done for keeping your friend safe. It's not always easy to get people to believe you though.
As janeainsworth said foolishness is confined to the old.
A couple of years ago DD was a bit suspicious of someone who responded to her friend on dating site. Lovely girl, works hard, nice home in her 30's not normally daft but ...
DD friend was all excited about this chap. She showed DD his posts, all very lovely. He said he was an American working in the UK in a very "sensitive job" heavy hint at GCHQ,, didn't name it outright, mentioned Cheltenham.
Her friend was saying how good looking he was, wrote lovely posts and he must like her if he'd told even something about his job.
DD did the "be careful" and then got busy checking. She told her friend what she'd found out but poor soul didn't want to accept things. Put it down to "how would YOUR dad know that?"
To get her friend to end it DD had to bring her to our house even then she wouldn't believe what OH and DD were saying. We had to get on Skype to the USA with DD's Godparents before the poor girl would believe us.
So sad, so very sad.
These people are evil, as someone has already said.
I have no doubt it would have had a bad outcome if we and our friends hadn't had the ability to blow his lies wide open.
Just goes to show we can't be too careful even if we think we are tech savvy keeping safe isn't easy.