re: fooled by percentages
Ah, well that's because they aren't being taught the right thing. The school teaches them "percentages" and then stops. It has to go on to teach "how to lie with percentages".
In the UK, teenagers are almost taught the right things in English. There's a bit in the GCSE course about "persuasive writing" (see how they bottled it?) which is almost "how to lie with words". This is a good start and needs to be encouraged.
They are also almost taught the right thing about IT. All that stuff about "online safety" clearly *implies* that there are people out there who will steal all your personal data, lie about their age, trick you into sex, etc... but I fear that once again this isn't quite explicit enough.
Until you teach "how to be the bad guy *yourself*", you can't really expect people to be able to defend themselves properly against other people doing the same things. It's learning by doing rather than learning by listening to some boring adult droning on about it.