Why is it that the people with very little are often the first to give?
Madness string 98159
If they've truly changed, their reward is from the universe in the form of a more peaceful and fair existence. You are not the reward fairy. You are not a vending machine where they put in an apology and get a bag of no-consequences.
Time keeps ticking. Even if something seems like it will last forever, time will still make it seem like nothing. If it takes 10^65 years for something to die out... time will eventually get there and go on.