Exactly my point! They absorb it from culture. From the stuff that matters. People -- including children -- can tell the difference between reality and fiction. Quite trivially, in fact. They know one matters and the other doesn't (unless it's to argue about pointless minutiae on internet forums! Then it's WAR!)
That is a much more general statement than what was contained in my question. "Influenced" and "media" could mean anything. What I'm saying is that we don't -- and certainly shouldn't -- draw morality from works of fiction, specifically.
Take HBO's Rome. Great series, but most of the characters are, by today's standards, morally bankrupt. Does anyone suddenly want to embrace ancient Roman culture because they enjoy the show? Nope.