I think they were abused, I think they committed murder, and I think they were rightfully convicted.
Now, when they are up for parole, the parole board is not re-trying the case but determining whether TODAY they are fit to enter society. Sure, the board factors in the original crime and trial, but they also look at their behavior since the convictions.
And their behavior since the convictions is keeping them in prison. They can try again in three years.
(And, honestly, I predict they would commit financial crimes if they were released, fwiw. My opinion.)
jmopinion