There are degrees of sickness, right?

Absolutely, 1000%. And the example you gave, 1000% with you on the possibility of rehabilitation there. Frankly, I think that 99.9999% of people can be rehabilitated in finite time. The other 0.0001% are literally the billionaires and their cronies. (And I believe that this is numerically in the ballpark, since the billionaires number about 3000 and there are about 8.2 billion humans on this planet.)

On the other end, people in the Epstein files might need to be hospitalized for more than a single human lifetime.

Yeah that’s really who I’m talking about when I have my doubts about rehabilitation for a very small subset of people.