He adds fault to fault who sets up a defense of a wrong committed by him.

Explanation

(English-origin maxim.) A wrongdoer who attempts to justify his wrong compounds his offense — defending a bad act adds a second fault to the first.

Where this applies

• A contractor who built a dangerous structure and then argues in court that his shoddy work was actually a creative design choice makes himself look worse, not better.
• A driver who caused an accident by running a red light and then claims the other driver should have gotten out of the way adds insult to the original wrong.
• An employee caught stealing from the company who then argues the company deserved it because they underpaid him compounds his offense by trying to justify theft.