No parents should ever have experienced the trauma or horror of what Otto's parents suffered.

One good way to avoid that is to do whatever is humanly possible to prevent your kid from going to North Korea.  Now or then.

Then, inculcate your kid with the judgment and discipline to avoid doing things that are going to lead to a totalitarian regime arresting you for theft, or defacement, or whatever of THEIR government owned property.

Wise parents don't let their children go swim with sharks.

Wise children don't go swim with sharks.

What did you expect Mr. and Mrs. Warmbier?  From Kim Jng Un's regime relative to an American citizen who thought it would be funny to go steal a government poster?

Yeah.  The North Korean regime is horrific?  Did it take the death of your son to realize that?

And, I don't want our country to go to war in the name of, or for the memory of your son.  

I mourn with you.

BUT, you nor your son EVER asked me whether it was OK to put my family at risk.