One reason not to focus too much on his death might be because it seems to have been more "random mistake" than "heroic sacrifice"? The children had already been located, the system for supplying and evacuating them had already been arranged, and everyone who entered the cave had all the supplies and equipment they needed to perform their tasks.

Running out of air while diving is a mistake that any amateur diver with crap equipment can make, but we make it while 50 ft deep in open water, so we just swim to the surface if our buddy isn't close or attentive enough to help us. [0] If you're in a cave you can't do that, but if you're a professional military frogman with fancy professional equipment you probably shouldn't make that mistake. If the global media had concentrated to closely on this, embarrassing questions would have been asked. Therefore it's better that everyone just praise his courage and move on.

[0] I did this, when I was 13 and I was using a system with a bad air gauge. When everyone got to the top, the dive master said "OK, you've done an emergency ascent, now switch tanks and we're going back down to practice buddy breathing." I haven't run out of air while diving since that episode.