the clear, crystal raindrops also come from dark clouds.

Basically the habit is neutral
not knowing when the habit first appeared and why the habit existed. A habit is difficult to stop, especially if it has been attached for years. During our life in this world, we must have done immoral, either accidentally or intentionally. No matter how good the person is. But there are times when the person who has committed the immorality changed. Nothing is impossible in this world.

Badness of a person's behavior in the past, they must someday be changed if it has gained guidance from Allah SWT. So you should never think that people who behave badly will forever like that. Because the crystal clear rain water is also coming from dark clouds. And although making changes is not easy, but there is no harm in trying and trying.