Quibble. The intention of the con man is to commit fraud which is to knowingly take value from his victim thus making him poorer. So, yes, the con man has a very personal interest in making his victim poorer.
No, his interest is in making himself richer. He wouldn't be deterred from his crime if, for example, the victim was insured and ended up no poorer. Just so long as he ends up with more money, he's happy.
In the same way, I suppose that at least the more cynical sections of the right-wing media don't want to produce screaming twitching paranoid lunatics
as such. It's just an inevitable consequence of their marketing strategy.