Why because we are in a fallen creation, according to the Bible. There are many problems in this world and paradise would be quite different then this one. Can you just imagine a world with no disease, no suffering, no viruses, no fungi. If this wasn't a fallen creation we would have no exploding volcanoes, no tornadoes, no rock slides, no flash floods, no droughts, no deserts, no cyclones, no brush fires, no grinding glaciers, no dangerous canyons or cliffs, no ice capped mountains, no frozen lakes, no earthquakes none of these natural calamities that some attribute to a ‘fallen world’.
Creation fell when Adam fell, therefore sin, so to speak, killed creation. As a result, we live in an imperfect world, with the effects of sin running through it. We see that the universe is running down. That is, everything is moving toward chaos, becoming less organized. Furthermore, because sin is in the world, mankind is unable to live in harmony. Nations rise against nations, and peoples against peoples. War and conflict occur with the loss of life, and with injuries to those who survive. Devastation is left in its wake.

Earth was once like this paradise described there were no disease and suffering We would have all these problems if we listened to God when he instructed us Genesis 2:16-17 "Of every tree of the garden eating thou dost eat; and of the tree of knowledge of good and evil, thou dost not eat of it, for in the day of thine eating of it—dying thou dost die."
If we listened, things would be different, there would be no tumors to fester in our bodies, no sickness what so ever and no death to speak of. What a beautiful world it was.
What's your vision of paradise? Join my curiosity, give yourself to Jesus today. Receive the gift that God wants us to have. Let's explore the new earth that God will give us, together.