Man proposes, God disposes!

Many a times life throws open a challenging situation leaving us wonder why something happened the way it did.
I was reading through Anne Frank's journal and the fact that someone could suffer for almost 4 long years just because someone belonged to a particluar race was very upsetting.
At the end of all the suffering, it would have been wonderful had she and her compliance survived the ordeal. There was a small hope in each of them that kept them alive through all those years. But the ending as it happened - was very depressing. To consider that they were so close to escape and still did not survive was really shocking.
What was the plan in store? If they has to face a brutal reality as death in the end - why were they kept alive for 4 years in a small cell? If they had to be captured in the end - why were they so close to truth and still went so far away?
I am too small to understand the higher scheme of things.
Maybe thats why they say , "Man proposes, God disposes! "