George's two step refutation is the shortest way of explaining why we cannot take credit or blame for our actions.

"For we who appreciate speedily arriving at the heart of a matter, here’s how to disprove any free will argument in two easy steps: 1. Ask the free will believer to give an example of a choice they consider to be freely willed. 2. Ask the free will believer to say whether or not that choice was caused. Congratulations; you’ve just won! If the free will believer says the choice was caused, the ensuing causal regression makes free will impossible. If the free will believer says the choice was uncaused, the choice cannot rationally be attributed to a human will. You can easily apply this two-step refutation to any, and all, free will arguments."

You can find this and more in George Ortega's book: "Exploring the Illusion of Free Will".

http://amzn.com/B00DINW91Y

George was originally the guy who explained why free will is impossible in a way I could understand. Check out his website for more information.

http://causalconsciousness.com/