They dont rest in peace as those who were saved and repented before their bodies died.
However, they do have or retain a love of God that prevents them from belonging to Satan or to hell.
Therefore, they rest in purgatory after their bodies die, burning for Christ in the purifying suffering of their unrequited love and longing for Him until the final judgment.
Ive read that those in hell truly wanted nothing to do with God in life, which is why they followed Satan.
So, naturally, they feel the same way in death as they did when they were in body.
Just speculation, of course.
This is why you know purgatory is not real.
"For God so loved the world the He gave His only Son...."
That includes everyone--whether we love Him or not.