Yes. ^^^
But of the two evils --they had to choose the worst of the two.
KK has no claim to baby K.
PF was the killer and would have been a threat to baby K's life and/or the Berreth's had he walked.
Even Cheryl has said publicly that she feared PF might kill baby K. before they received custody and while she was in PF's care !
That had to be ghastly to think about.
That poor family, worrying for little K.
That's not to say he can't try some further evil from behind bars.
Wouldn't be surprised if ma F. smuggles a phone into his cell.
Imo.