Of course Trump's going to say what he did about Wambier's case, but it doesn't mean he believes Jung-Un. How can you negotiate with someone if you verbally attack him? It can't be done. Was it more important to attack Jung-Un or try to stop his nuclear weapons ambitions? It's a no-brainer. Trump needs them to continue talks. Making a statement just to make a statement would do nothing to accomplish the Trump Administration's objective to protect the American people.
I hate to say it but Otto is gone. Everyone (including North Korea), knows the truth about what they did to him. The Wambier family knows the truth and I'm sure that they'd like for Trump to punish North Korea somehow but to what end? We're not going to attack North Korea over it; that's never been any president's policy ever since the founding of our Republic. We already have crippling sanctions in place. Just what exactly do they want Trump to do? Trump is out for one thing and it isn't optics for political purposes, it's to keep us safe.