In Dean L. Overman's book A case for the existence of God (2009) he talks about why would an all powerful God allows evil to exist. He gave an analogy of a parent to a child. Why would a good parent allow a child to ride in an automobile? After all the auto may get into an accident and harm or even kill the child. A parent could be overprotective and not allow the child in the car at all. But then this would not be fair to the child. You can expand this analogy to not letting the child cross the street or ride his/her bicycle. Again this would not be fair to the child.
This is what God has done. He has given us free will to decide between good and evil. He also have given us a mind to make (hopefully) wise decisions. To be totally good we would have to have no free will and be completely programmed by God. He wants people to experience life even if it is dangerous.
What's this have to do with the Left? Most on the Left believe in big gov't control. They want the citizens of America to be totally protected by gov't. Not safety-nets or guard rails. Totally regulated. After all to the Left people are like little children who have to be always protected and told what they can and cannot do. I'm not talking about just morals mind you but being dictated in everything in people's life. Therefore the Left cannot understand why a God would not interfere in the life of man to protect him. After all that's what they think government's main role is. To protect mankind in every aspect of his life. Big Gov't = An all-power God. Why need a god when you have big gov't.