What is it?
The 'two wrongs make a right' fallacy occurs when someone attempts to justify an action by pointing out that others have done something similar. It incorrectly assumes that unethical behavior becomes acceptable if others engage in it.
Examples
Person A: 'Yes, I cheated on the test, but so did half the class.'
Person B: 'Our company's pollution isn't a problem because our competitors pollute even more.'
How to Avoid This
Evaluate actions based on their own merits rather than by comparison to others' behavior. Consider whether you would consider the action acceptable if you were the only one doing it.
How to Counter This
Point out that widespread behavior doesn't make something right: 'The fact that others do it doesn't make it correct or ethical. Each action should be judged on its own merits.'