Only people who have forgotten that they're human think like that. Anyone who knows that we are humans, we are living beings, knows very well that there is an end to all this. Everything, including us. The real life starts after we have been freed from this vessel that carries us through this place called "earth".
Other reasons why people think that could be anywhere from greed, love of the world, love of the worldly, and ignorance. All these things can make you forget that you're going to die.
hasin_
