Well, they can forbid the site in schools. They can restrict the game in Germany, like Q3. It's easier then reform the school system and develop programs against youth criminals.
Then some party can say afterwards, that they have done something nice for children!
But in fact they just failed, they wasted money and hours of work.
I played Q3 on Monday in my school, since I found it installed on PC.
Last year director have forbidden to install games (especially Q3 and War Craft 3). They restricted access to C: on almost all computers in the school, but you simple create a shortcut to C:, copy and access the *.exe of game.
The teacher isn't a bad man, but he studied economy and works as informatics teacher now. To explain what are classes in Java with examples of cows, humans, cars and swearing on Java over 2 hours just fool you.
To not hear is the best you could have do in this hours. The state shouldn't waste money on restrictions, for example some teachers need training more.