Bear said nothing personally, but I'm the only one to link to snopes in any recent post, and it was in reponse to stuff he was posting. We have to be "rude" because we're tired of the way stubborn old people refuse to do more than the most cursory of checks before passing on more of the spam that clogs the internet, and how they cling to their interpretation of something without analyzing it in the context of what's actually being said.
The intent has nothing to do with being rude, and everything to do with encouraging people to do more than copy/paste/forward email junk. You ask what better way to keep facts straight? How about a few quick searches, looking for multiple sources of evidence to support a position? How about reading news from all sources, not just the one with a bias you favor, before forming your opinions? How about not believing something you get in email, simply because you trust the sender?
Those forwarded emails play with an interesting bit of the human psyche. Sent from the original source, or proclaimed by a stranger, you (general 'you', not a specific one) would hold a higher level of required evidence to believe the contents contained therein. However, when the email gets forwarded, the brain takes a shortcut and says "from a friend I trust, the content must be trustworthy." This shortcut has an obvious advantage when you're considering something like cavemen telling each other what to look out for - trusting those close to you keeps you alive. However, in the modern context it leads to leaping logical gaps that should otherwise be examined. All I do is ask that people do a bit of fact checking on their claims and provide their own analysis/interpretation instead of only pasting something they received in their inbox next to ads for viagra and nigerian millionaires who want to give you money.