Perhaps because the end of this system is far removed from us, and even if it isnt it is no big deal. If we are going to be judged, it is at the end of our lives. Whether we die now from a heart attack, or get run over by a car, or survive until the "new system" is irrelevant. The only thing that matters is how we live our life during our alotted span. so dont worry about "the end of the world". It is of no real importance to you, unless you are a Jehovah's Witness, which means, as well as being deluded, you are well and truly lost.