As much propaganda as being disseminated, I don't know how a parent could keep all of it away, and all of their children aware over the course of many years in regards to the dangers of these techniques.
That aside, parents should be responsible in their childrens' lives. There will be no debate in that regard.
It doesn't get any better at the university level. Not long ago I had to read a book on Meso-America where, of course, the Evil United Fruit Company was dwelt upon long and hard. My favorite part was where the author tells us ominously, "by 1950, the UFC had total control of Guatemala's railroads!" Only later, doing my own web-search, did I find this little interesting detail: the UFC were the ones who BUILT the railroads.