Why do things happen?

Many people can not understand why God lets such horrible things happen. It really is a question that only God can answer. We can only guess why.
Deeply sad as what has happened. The tsunami has brought about an incredible out pouring of love, help and giving from thousands around the world. Many people who themselves were caught up in the disaster have found within them inner resources and have unselfishly helped others.
Others have seen a need and traveled from their safe and comfortable homes to assist in any way they could. They had no idea what they could do only that they could and would help.
Often it is by adversity we progress. We learn lessons. If there is next time warnings systems will be in place.
Also the debts of the countries may well be cancelled and this can only be a good thing for them.
I believe in an afterlife/heaven where all will be reunited at the appointed time. Other wise it makes no sense.