What use is ethics?
If ethical theories are to be useful in practice, they need to affect the way human beings behave.
Some philosophers think that ethics does do this. They argue that if a person realises that it would be morally good to do something then it would be irrational for that person not to do it.
But human beings often behave irrationally - they follow their 'gut instinct' even when their head suggests a different course of action.
However, ethics does provide good tools for thinking about moral issues.