At some point there's only so much you're able to do. Once had someone ask me how to send their bank account information to someone. I asked why, and they proc

At some point there's only so much you're able to do. Once had someone ask me how to send their bank account information to someone. I asked why, and they proceed to show me an email from a scammer. I told them it was a scam, and their response was that I was trying to keep them from making money. First thought was okay, I'll prove it's a scammer; scammer and the person had already exchanged a number of emails, which I exploited to get more information from the scammer. Using bit of social engineering and data leaked from the scammer, I was able to discover the scammer's exact location. When I confronted the scammer, they demanded to know how I knew where they were, then stopped responding. The person that originally asked me how to send bank account info - having watched everything I had done with an explanation added - blamed me for chasing away a valid opportunity. Week later, scammer contacted them again, and they sent cash requested by the scammer via mail. Should the bank have asked them what they intented to do with cash withdrawal? Should the bank make sure they're not lying? Is the bank responsible? If yes, I disagree. (Scammer was on a street in Lagos, Nigeria.)