@neologist,
I'm not sure what you're alluding to here. I have a hard time accepting that all of humanity has been suffering a 'miserable' existence for 6,000 years.
On the other hand, it's hard to convince an innocent man being 'drawn and quartered' or a nine-year-old sex slave imprisoned in an outdoor chicken coop about how much God loves us.
Any God that is 'OK' with that is exactly what you mentioned-- one cruel
motherf#*^er. But... I don't think he is though.
Accepting the fact that some higher intelligence is in control of a reality that we are obviously not in control of is easy to do. Holding fast to the idea that God is 'good' in the face of human atrocities is a different story. How do I reconcile that? It's complicated.
Where do I stand? It's definitely the most difficult idea to wrestle with... but I try and find solace in the teachings of Jesus. He unabashedly spoke of the 'ruler of this world' being the nefarious Satan (a rebellious angel) that has been allowed control of humanity for the time being. At the same time, Jesus stood unshaken in the face of his destiny and his assertion in the final authority of his 'Father', God.
We're supposedly fighting a battle between debasing into a sacrilegious pit or elevating ourselves to God's ideal-- proving our loyalty and earning a place in the kingdom to come. One promise is that no matter how horrible and wretched our situation, it is fleeting and all of our sufferings will pay tenfold in the next stage of our being.
I'm still out to bat as to whether Satan is the personification of our own tendency towards hedonism and ego-centrism, or if he is an actual rebellious entity created by God that has been allowed to proceed in order to prove a point.
So... the answer as to why God allows human suffering? I don't know. It's part of the test? No matter what, I believe that any suffering will either be trivial in the grand scheme of things, beneficial for the development of our character, or redeemed to us many times over after it has all been said and done.