FREE KIDS!!!

Not as in, i'm giving away kids for free. As in, let them be in their own world!
There was this little girl on the bus, with her grandmother or something. I don't know since when i'm so sensitive about kids, it has to be a book i read, but that's not the point. The girl said that she wants to get married to this boy. Her grandmother was all like 'ah, you're too young to have a wedding! What kind of a wedding will that be?!' And saying stuff like 'You don't know much about marriage, that's why you're saying it... When you'll grow up and learn, then you'll think it over, ha ha ha'
It pissed me off! I really wanted to talk to that girl then and tell her that she's right, and if she thinks that she should marry this boy, then she should.
The thing is... They're telling young kids stuff they shouldn't. No matter why this thought came to her mind, it's nobody's right to tell her she's wrong! Even if she thought there were pink fluffy aliens on the bus, nobody should have the right to tell her 'that's never going to happen. You see, pink fluffy aliens don't exist.' Kids should have the right to believe what they want to believe, what they think is right, and not getting into stuff like 'ah, my mom said this is right and this is wrong'.
Yeah, sometimes this has to happen, cause it's not right to hit other kids. But even in this case, it should be more important understanding why you shouldn't hit other kids rather than just saying 'that's wrong'.