One reason is that there is always some conspiracy theory stating that the end is upon us. For example such as the 2012 world ending doomsday scenario with the Mayans. Or either more recently the Ebola virus outbreak, having people frighten and making them think that it seem quite reasonable that the final days are near. My point is that there have been so many world ending scenarios that it should seem quite inadequate to think that there would be some apocalyptic catastrophe. Some may believe these unreal ideas depicting the world ending but I say that they are just hindering you life style because you become so focused on it, that you forget the important problems in you life.
People need to wake up an understand that the world isn't going to end in complete decimation and chaos. If conspiracy theorist stopped making ideas of the world ending then there would be less panic in the world. After all if the world was really going to end then it would have ended years ago.