If you are a skeptic you already know how we help such people. We expose people like Sylvia Brown so that anyone willing to listen to a skeptic can learn that it is a scam.
If people continue to believe after that, it's unfortunate, but they can't say nobody told them.
There is a proverb about this: You can lead a horse to water, but you can't make him drink.
Yes, that's true. You can't make people not believe.
But is that enough for you? If they won't see the light - the candle in the dark, so to speak - you will just let Sylvia Browne and her ilk continue to scam them?