Why do people not investigate anything?

So, I just got one of the typical GOP talking points e-mails forwarded from my Grandmother. *sigh* How do people believe any of this crap? It seems like GOP voters are the most gullible people on the planet. In all seriousness they could have sent out an e-mail that says that Barack Obama frequently defecates on the homeless in public and most people would believe it. Does no one research anything at all? I may be a die-hard Obama supporter, but if I got an e-mail from someone about anything (even something John McCain might have said/done) I would look into it before believing anything told to me through e-mail.

Oh, I forgot to tell you what was in the message. It contained the quote "Remember Obama said in his book 'Audacity of Hope', 'I will stand with the Muslims should the political winds shift in an ugly direction'.....what better place for the Muslins[sic] to control our country, than in the office of the President of USA."

No matter how infallible the holy platform of INTERNET MAIL is, I thought something might be wrong here. So, I opened up the good ol' Google and typed in "I will stand with the Muslims." The first link was an article that said the same thing that the e-mail my Grandmother sent me said. At the top of the page was a correction that stated that the quote was incorrect. The second link was to FaceCheck.org where they provided the correct quote. So, I replied-to-all on the e-mail my Grandmother sent out and provided the correct quote. For those that are interested the quote is "Of course, not all my conversations in immigrant communities follow this easy pattern. In the wake of 9/11, my meetings with Arab and Pakistani Americans, for example, have a more urgent quality, for the stories of detentions and FBI questioning and hard stares from neighbors have shaken their sense of security and belonging. They have been reminded that the history of immigration in this country has a dark underbelly; they need specific assurances that their citizenship really means something, that America has learned the right lessons from the Japanese internments during World War II, and that I will stand with them should the political winds shift in an ugly direction."

I sent out the message and received some replies from the people that my Grandmother had been forwarding this trash to. One of them was really surprised and has vowed to start taking everything that they see on the internet at face value. I felt satisfied with my good deed for the day until I got a response from my Grandmother. She said that she thought that I was seeing things differently because of my point of view. She said that she had researched the quote and did not find anything wrong with it (which was discovered to be untrue because a simple Google search would have cleared up the confusion). She also thought that I was mistaken because the people I talked to are one sided. I still don't quite understand how the correct quote from the book can be one sided; but I guess that there is nothing I can do to reason with her. *sigh*