As humans we tend to have little to no ability to deny the urges and desires we battle daily. Giving in is often the most sought after choice. Something that may ease us along the way of indulgence is the simple words "What if there are no repercussions?". This simple sentence can justify any nefarious act. The possibility that God and morals don't exist is one thing that has perhaps justified more atrocious acts than any other.
Now let's humor the idea that God has been proven to exist. Imagine...