Will someone ever change their ways around people who encourage their behavior?

If someone owns up to the fact that they have messed up, and say they know that they were wrong but keeps doing the same stuff again knowing it's wrong because the people in their life encourages that behavior and does the same kind of thing, will they ever fix their behavior or resent you for making them change if nobody else sees anything wrong with it but you.
Will someone ever change their ways around people who encourage their behavior?
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