Something tells me it's not just the children who seem to be suffering from (or relishing in) sheer stupidity, but that could just be a vaguely obscure use of irony...
The children used to answer those questions were probably dicking about. It's not the teacher's fault that children are stupid, or when it is, the teacher has probably given up and doesn't really give a shit anymore because they've taken that much crap from inbred yobbos they just can't be arsed with it. Teachers teach what they are taught to teach... and paid to teach... They do it in practically the same way as it has been done for a long time except they're not allowed to throw things at the little buggers like old school teachers were, see if I'd have had a board eraser thrown at me a few times, I'm pretty sure I never would have told my art teacher to get screwed because I didn't want to wash up.
Saying that, it isn't the lack of punishment either, it's a lack of interest, with games consoles, crap tv shows and the internet being crammed down their throats on a daily basis, very few of them look at things like books and go "wow that might be interesting."
History: why read a book or watch a documentary about war when you can play a game about war?
Edit: I read this all back and it makes me realise I talk about this in a "back in MY day" fashion, yet "back in MY day" was only about 3 years ago... Mind you, I call 18/19 year olds "the youth of today" as well... I'm too young to be old... >.>