Think of the kind of playground "grassing" that was so common. Miss, he's stolen my jacket! Miss, he's stabbing me with his pencil! Miss, he's put my shoes in the toilet! This will be an online version of that. An eternal hell of kids thinking other kids are pedos and reporting them for the slightest offences. Facebook will become like Club Penguin.
As for CEOP, it's on some sites already and the people who run it are incompetents, and widely known to be. Any kid with a brain blocks the offending person and LOICs any hate sites.
Apart from anything else, Harman is a gynosupremist bitch. Feminism's one thing, incriminating every single male in existence is another. If she was male, she wouldn't even be in. Although I'm British, I hate the bias of British politics.