Young children don't do the grocery shopping. Parents need to take responsibility and not buy unhealthy food for their kids. I'd say children up to a certain age are drinking this stuff simply because their parents bought it for them (How else?).

Plus, "when they target children" would simply become harder to define as companies would modify their ads, but the problem would remain if parents aren't taking an active role in educating their children themselves as to what is unhealthy, and making purchasing decisions that are healthy, instead of depending on the government (or corporate advertising) to do it for them.