User blog comment:Drache Mace/They're Kids!/@comment-24631732-20140805093817/@comment-11188061-20140805112943

A form of stress release, duh. It's not just swearing, there must be times when you're a kid where you go all 'stupid stupid!' yelling because of frustration, and that actually counts as swearing as well. It's just that the 'level' of your swearing is still low at the time, and as we grow older we learn more 'enlightening' words.