Yes because life imprisonment without parole is worse especially if they have to spend their lives in solitary confinement.
If hard labor is added, then I'd say that life without parole is a worse punishment than death penalty. But that is not the case in the vast majority of the nations and the life inmates usually spend their time by raping the other prisoners and playing video games. And each of them cost a fortune or the tax payer in the form of supervision, food and accommodation.