There is no logic in most TV shows, specially animes. I mean, a kid with with a monkey tail is kinda weird, plus, did you realize how many times this talk happens?
"Son- Hi mom. Can I go on an dangerous adventure with lots of monsters and/or evil people trying to kill me, almost falling from a super high place some times and depend on good hearted people who live isolated in the forest to many things, since I'm not bringing any money, food or cell phone, which means I'm going to starve, get lost and never call you or come back here to visit you, considering that I would survive?
Mom- Sure you can! Have fun. I love you. Now GO!"