Because knowing is the only way to start preparing. Not saying it's the only thing on my mind. I do go on with my life sometimes without thinking about it.
I rather be prepared for something to come, instead of waiting until last minute and saying, "F***! I should've listen to that crazy man running down the street. Oh well! I'm f*cked!"
Wait....so if Nibiru is true, and Earth is going to be destroyed in 2012, then there's really nothing we can do, right? I mean, there's not enough time to colonize space. Either way, we're screwed, so let's just enjoy the ride til then. Who knows, we could get hit by a car crossing the street before then.
I, personal, don't think this will happen, but I ain't mad at ya for your way of thinking. Nobody has the right to tell you what to think, and vice--versa. Well, not until they can prove that it's not going to happen, or you can prove that it is going to happen.