Can’t the model be used to rationalize somebody’s behavior?

Let’s say somebody kills someone. They’ve come to you for coaching, and they tell you how terrible they feel and help them come up with new thoughts so they don’t feel terrible anymore. Isn’t that just helping them rationalize behavior?

Can’t it just be used to help people feel better about stealing, raping, or any other negative behavior? They might feel bad about it but not sorry.

And yes, I know the bad/negative behavior is all in my thinking but please clarifying not using the model to rationalize.