1) This world is not your home.
I have given them Your word; and the world has hated them, because they are not of the world, even as I am not of the world.
John 17:14
2) There are many reasons this world suffers. Just one reason is that NO injury, sickness, pain, in both innocent children or the aged, is senseless. Humanity has conquered diseases, avoided conflicts & wars, learned more acceptance in diversity, & cares more for the lost in these sacrifices. Anyone that writes off human suffering as useless is not human or moral. There is a reason for everything.
And we know that God causes all things to work together for good to those who love God, to those who are called according to His purpose.
Romans 8:28
3)When we go home we do not sprout wings & play harps. We are saints. We will have a job to do. A job that requires skills & responsibility.
2 Or do you not know that the saints will judge the world? If the world is judged by you, are you not competent to constitute the smallest law courts?
3 Do you not know that we will judge angels? How much more matters of this life?
1 Corinthians 6:2-3