How do people explains this? it couldnt be more obvious

It was a nervous laugh, nothing more.

>Parker blamed himself for that momentary smile. He was nervous and didn’t know how he was supposed to start talking to reporters. His father was standing near him and offered brief words of encouragement, using a childhood nickname, prompting the laugh. Parker became disgusted with himself, he said. He believed the other families blamed him, too.

[https://www.washingtonpost.com/nation/2022/10/13/sandy-hook-father-alex-jones/](https://www.washingtonpost.com/nation/2022/10/13/sandy-hook-father-alex-jones/)