What proof do I need to show that lying, murdering, stealing, etc., is "bad"?
Your average politician probably thinks they are virtues.
Let me ask you a few questions,
When you watch a PBS documentary about the lives of the wild animals in the Serengeti do you see evil everywhere with murdering, stealing, etc., through any number of deceptive means? Does it make you doubt the existence of God or see a need for any of the animals involved in the struggle between life and death in the wilderness to be tortured forever in sulfurous flames?
Second, If your perception of what is good and bad among people is based on a perverted interpretation of the commands to not murder or steal, fornicate, eat the flesh of swine, etc., then isn't it this perversion in your mind that would make you see evil everywhere?
Wouldn't that perversion cause you to be so unaware about what is actually happening on earth that you could be a murderer without ever lifting a finger against anybody and never even know it?
For instance if the consequence for Idolatry is death and you believed that it was a religious duty to persuade other people to set aside the divine command and worship a human being as if he was a god then you would be a murderer, even a serial murderer, in the eyes of God even if you didn't have a violent bone in your body and would never even swat at a fly.