So much of the world's suffering results from the sinful action or inaction of ourselves and others. For example, people look at a famine and wonder where God is, but the world produces enough food for each person to have 3,000 calories a day. It's our own irresponsibility and self-centeredness that prevents people from getting fed.
Courage would be impossible in a world without pain.
When you are in the midst of suffering you are looking for someone to be Jesus to you. You are looking for someone to love you and help take care of you, and reach out to you.
There are Eastern religions that deny the reality of pain and suffering. They just try to wipe it away by saying it's all an illusion.
It is very difficult to give a 15 second sound bite on why there is pain and suffering in this world and not have it come off as being flippant or surface level or superficial.