İs there a personal benefit of laughing?

Laughing ia mostly explained with a react to being safe together/giving a signal nothing's wrong or a reaction to unexpected things. So it's a community-based action. But i think there needs to be more of them. Because, physically, crying and laughing are so similar. İ realised it when i thought the person was going to laugh when they started to cry. And crying is a "help me" signal, so i think it makes it selfish. You can make your realitionship with the person who helped you but the crying is just a "help me" signal. You just ask for a help yk? You can thank for the help afterward, but at first you just want a help. So i think there must be a personal benefit of laughing, because some bad people laugh or smirk at the "inferiour" people, Or people can laugh at something by their own (for example instagram reels or thinking about a memory). İt just cant be being safe, right?

Or is my EQ too low and i am so alone i cant understand/believe casual human intrections?