A friend lamented today that her one-year-old daughter finds joy in everything, while her six-year-old boy finds joy in nothing. She wondered what the world is doing that it steals happiness away from little children so quickly.
She is a very involved mother who takes her children many fun and interesting places. I suspect a main culprit in causing her son's joylessness is advertising.
The purpose of advertising is to make us aware of a product and hopefully desire to obtain that product. How do the creators of advertising manufacture in us a desire to obtain the product, though? If we, the targeted audience, are content with our lives, we are unlikely to disturb ourselves to go out and get the product. What would be the point? We're already happy! So advertisers--sometimes knowingly, sometimes not--frequently present to us messages aimed to diminish our feelings of well-being. Then we're more receptive to the idea of seeking to get our happiness and contentment back by buying their product, which they promise us will make us feel better!
If you want happy children, minimize their contact with ads. Advertisers don't love your children; they see them as market share.