Should certain violent crimes, especially predatory crimes, be a one time and your are out (lifetime) sentence?

I've often thought and strongly believe that certain crimes, and their perpetrators, are unforgivable. That no sentence less than a lifetime sentence with no chance of parole should be given. That is especially true for those crimes that are predatory in nature.

A predator will always be a predator. End of story, and a predator should be jailed and never see the outside of a cell for the remained of their life. That's my strong belief and conviction.

What do you think, and if you care to explain your thoughts, please do so.