It all depends on the individual, of course, but the point is, if we don't make appropriate efforts at treatment, rehabilitation and ultimately reintegration, people will come out of correctional facilities no better, or perhaps worse, than when they went in, and that will increase the danger to the public.
Our whole goal here is to be successful at the treatment and at the rehabilitation so that this person will not offend again, there won't be any more victims from this particular individual, and our communities will be safer. When you have fewer offenders in the future, fewer victims and safer communities, your costs go down.
It's a difficult thing to quantify, but the investment in treatment, intervention and mental health care, considering the huge proportion of that population that requires mental health care, is an investment up front that is bound to save dollars down the road.