I'm more of the opinion that the rapist gets one last chance. Repent of thy sin (in the truest sense of the term) and rape no more, or die. Killing the unrepentant sinner (who is only going to continue sinning and won't ever stop) is actually a mercy you're doling out to them. Those that boil in hell for all eternity in oil can at least be glad someone ended them before their sins piled up even more and landed them boiling in the most vile and foul excrement imaginable instead.
This is a critical part of Christianity that most (even many Christians) don't seem to really understand. God is Love. God is Mercy. God is Truth. God is Justice. People tend to forget about that last one even though it's why Christ had to undergo his passion in the first place.
It's a high bar for a given individual to clear as death isn't something you can just undo if you fuck it up (and if you do you're guilty of the sin of murder and must repent of that yourself) but if you gave them a second chance, told them what would definitely happen if they did it again, and they do it again anyway, well, I don't know about you but my trigger finger just got extremely itchy.
Also, the systems that'd be required to make your utopian flight actually viable and enforceable are dystopian. At that point you got the "1984" panopticon of Big Brother with a searchable universal global DNA database to reinforce it to yet another nightmarish level Orwell didn't think of. A fun personal flight of fancy perhaps, but not a world any sane person would want to live in.
Quality shitpost, but we both know that's not how it actually works .