Psychology says people who laugh during serious situations aren't heartless or insensitive, they may be trying to manage intense emotions differently

Psychology suggests that people who laugh during serious situations are not necessarily being insensitive or disrespectful. In many cases, the laughter reflects an emotional response to stress, discomfort, or tension. Understanding the context and the reason behind the reaction is often more meaningful than judging the behavior on its own.

Raccontata daeconomictimes.indiatimes.com