It could be cheaper to pay the carer than to keep them in prison. Come to think of it, I once read that it was cheaper to stay in the Ritz than it is to keep someone in prison – for the same amount of time.
Perhaps a full-time carer would require less payment per 24 hours than a 24 hour period behind bars???
Mind you, I guess the Germans were right about one thing – it’s cheaper to just shoot them – (this is meant as a morbid joke only)