Sorry, this was aimed more at the "someone should have known" crowd.
If they committed crimes then they should be prosecuted. This is a pretty unusual case. Lets not overreact.
Frankly, I don't see how this bizarre crime could have been predicted by the Bordens or avoided so long as Kara was committed to "being with" Ludwig and Ludwig was a nut case.
The Bordens apparently had done all the things good parents do in a case like this, including taking the last step of talking directly to the boy and putting an end to it (in their minds).
Some have suggested they should have gone to Ludwig's parents, but who knows if that was viable. I guess they could have gone to the police for a restraining order (since Ludwig was likely committing some kind of statutory rape type law). But realistically they had no clue where this was going. You certainly wouldn't think your life was at risk.
"This is a pretty unusual case. Lets not overreact."
Let's not underreact either.
sw