When Sam tells Max Cady in a car that...
... there is a death penalty for rape ("Rape is a capital offense, you could've gotten death, you could be sitting on death row right now"), even though we know that MOSTLY it ISN'T true, in the context of the scene, it can be merely interpreted as Sam Bowden attempting to justify to Max Cady that he did all he CAN to give him a lesser sentence, but could his speech also, to an extent at least, imply that...
Whilst it (sadly and unfortunately, as many would say) isn't the case as far as officially established LAW is concerned, it does mean that as far as CIVILIZED SOCIETY is concerned, and with the ways in which it impacts the victims, people have a great sense of justified repulsion and a wish for such individuals as Max Cady to die for their violent deeds and that in a way, the lawyer Sam Bowden was expressing his inner HATRED for Max Cady and what he's done by metaphorically saying that "America has a death penalty for rape", even though it actually does not REALLY have it, but maybe Sam Bowden thinks America, and civilized WORLD for that matter, SHOULD, since we sadly cannot just wish for these things, and even lesser injustices, for these things not to happen in the FIRST place.
Watching it with modern eyes, I couldn't help but interpret at least to an extent Sam Bowden (Nick Nolte's) speech that way, as if he was saying that part of wishful thinking on behalf of civilized society (yes, I am aware there a sadly a LOT of people including laws that think OTHERWISE, but I do NOT refer to THEM as "civilized" but that's another story) and expressing in a way great frustration and anger an Max Cady's actions.
Anyone else think that, or am I perhaps reading a little too much into it?