Why do people blame God for theur sadness?

Is it really necessary that God is the only reason for their sadness? Whenever somebody gets hurt,they just start blaming God. Even I lost my brother but I don't feel necessary to blame God for this. I know whatever God is doing,He have a plan and He is doing this for good. Yeah I miss my brother so much. I just feel sometime that if my brother woulb be alive He would be helping me and be happy to see me so grown up. But he is gone now and I had to accept it. So I moved on and walked on God's path and just hope to be worthy to be alive and make my God and my parents happy. Its too sad to hear people blaming God for their every sadness. When a person of their own die,they just start saying-"God you are the reason for my sadness and everything".. But its not right and I feel sick of this kind of people. God is the main reason of our happiness. Just be worthy of what God's giving you. God will be much more happy to give you more. Love you God. Amen.