I am specifically thinking of those parents who murder their children or abuse them very badly. We could make them infertile but they could still adopt and murder/abuse so that wouldn't work. Putting them in prison for crimes yet to be committed seems horrible even if it were possible. But even more horrible is what the victims go through because of them. What to do?
A totally hideous concept.
I mean what happens (and it WILL) when someone is captured that is innocent. How do you defend yourself against what you might do?
It would profile everyone instantly for unfounded reasons.
Nothing is that safe that we can employ it with total confidence, least of all something like that. God forbid. Leave that in the movies for now and hopefully for the next century at least.