Why do people still fall victim to Western Union scams?

Gullibility.

Add to that mix, the limited understanding of doing due diligence, being aware of signs of a scam and the skewed vision that comes with sudden money that might be coming your way, in some way, shape or form.

But it all boils down to gullibility and statistics. If a sucker is born every minute, there must be 100,000s of them out there!