The kids take advantage. When kids do drink, they do it to get drunk. One group drinks, and the other doesn't. In one group, one kid wanted to try it, and he really liked it. Now drinking is common.
Kids get a rush from doing it.
It's like mountain climbing. Once they do it, they want to try again. Teens love to do something they think they can get away with. Kids who drink do worry about driving. There are designated drivers.