There could be many reasons. It could be that he didn't get the candy he wanted, or perhaps he was scared by something. Sometimes kids cry for no obvious reason at all.
Maybe the kid is sad because they lost their favorite toy.
There could be various reasons. Maybe the kid failed a test at school, or he saw something scary. It all depends on the context of the cartoon.
The kid could be crying in the cartoon because they had a fight with a friend or didn't get what they wanted. Sometimes, it could just be part of a funny or dramatic story.
It could be that the cartoon kid is crying because he failed in a game or was criticized by his parents. Or maybe it's part of a story to make us feel sympathetic towards him.
Maybe the kid got hurt or was scared. That could be why they're crying.
Maybe the kid is sad because he's facing some difficulties or feeling lonely.
It could be that the cute cartoon kid is crying because he got scolded by his parents. Or perhaps he didn't get the candy he wanted.
I have no idea. Maybe it's just some odd or random creation.
Maybe the ninja kid had a tough mission and failed, making him sad and cry.
Maybe it's because the kid's expressions and emotions touch people's hearts. It makes them feel something.