What sentence from holes contains the implied character trait that stanley is thoughtful toward others?

Introduction:

Holes is a novel from Louis Sachar that was published in 1998. The story is about a kid fat and lonely kid named Stanley Yelnats who was sent to a juvenile detention camp for a crime he didn't commit. The story shows the transformation of Stanley from being a shy, lonely kid to having friends and the obstacles he had to overcome.

The sentence from Holes that implies Stanley is thoughtful toward others is:

What worried him the most was the thought of his parents not knowing what happened to him, not knowing whether he was dead or alive.

In this sentence we can see how Stanley was not worried about dying, but about how their parents would feel if he died and how they would suffer from not knowing what had happened to him. This attitude from the character lets us know he is thoughtful toward others even when he thinks dead would be a relief.

the main reason that the constitution did not proclaim all men to be free and equal is because of the issue of slavery.