Point being (I believe), it is expensive to take a moral position. It costs you money and thoughtful action. You could secure the South Korean border without landmines. It just would cost a lot more money.

You could do a lot of other things (or rather not do them), but it might cost you your political standing.

So point being - playing the moral high card, as the US do around the world, should not follow the line from a Genesis song:

"Do as I say, don't do as I do..."

At least in my humble opinion (the same goes for my Governement, the German one by the way.)