I think the point is that this guy's information is certainly out there to find if someone would have done a background check, at minimum, which I would think is due diligence when you are letting an unrelated adult male reside with your two young daughters.
Yes, people get conned every day, but we far too often see a situation of unrelated male living in home resulting in bad things. It's worth checking into a person in the above situation, don't you think?
We don't know what happened in this situation yet, but I think this is an issue, in general, proven by statistics.