I don't think anyone says you have to accept Snopes as "gospel". But if I get a frantic e-mail with a copied, signed, official-looking letter warning me that if blink my headlights at a car coming along at night with its headlights off, I just might get murdered as part of a bizarre initiation to some bizarre gang, and then I read in Snopes that that letter has been circulating in various forms and places for thirty years without one actual case of such a murder ever being reported - well, I don't know about you, but I will be more inclined to believe Snopes than the letter ...

I think Snopes is a valuable resource, and I can't imagine why anyone would object to it - unless they themselves have been corrected with a reference to Snopes, and cannot bear the shame.