China seems to have the only adults in the room. Obviously they are right in stating that there can be no winners in a war between North Korea and the United States. And despite Trump's belligerence for domestic ratings, I'm pretty sure that his generals know that. 
North Korea may not be able to directly strike the United States, but by attacking its allies, South Korea and Japan, they could do enormous damage to the world economy, sinking the world into a full economic depression, not to mention the huge  loss of life that would result. 
As sweet as bombing North Korea may sound to some, it's not going to happen. There's just too much to lose.