There are certain behaviors that are demonstrably harmful to kids or to others when you let kids do them.
Swearing isn't one of them. Should a parent encourage it? I certainly don't think so. Should you have the vapors when they do it? Absolutely not.
The girls in the video were taught a script, like any actor. I've heard young kids in movies use the same kind of language. That doesn't mean that they are encouraged to act that way at home, any more than they're made to dress up in the princess costumes at home.
Apparently some of the posters here have ZERO training in child psychology and ZERO experience as actual parents or guardians or teachers of children. You do not let the colt buck and then give him grain. "What's one little buck?" is your argument. I am here to tell you, and so will anyone else who wrangles animals or kids [they all learn via conditioning], that if you let this type of behavior incrementally creep along unchecked, or worse, applauded or encouraged by adults, that child will not know boundaries as s/he ages. You are setting their fate when your "no discipline" ilk boots them out the door at 18, wholly unprepared for what boundaries really mean in the adult world: [death, prison, drugs, prostitution].
I've seen horses raised by hippies before. True story. They wanted their mare to have "a beautiful baby". So she did. And their zero-discipline policy they had with their incredibly rude and obnoxious children was extended to the growing foal. I wound up with two of these foals grown to horses. Both of them injured people so badly that they had to be put down. Their complete regard for decorum, distance and respect was zilch. If they felt like kicking, they kicked. If they felt like biting, they bit. If they felt like rearing or striking at their handlers, they did. Two people as a result of these horrible horses got brain injuries from handling them.
You don't want to raise children as if they're already fully formed, because they're not. They rely on cues from their guardians as to what behaviors are acceptable and which are not. If left to their own narcissistic devices [classic stage in homo sapiens from about age 2-4] and not checked in overweeing behaviors, you will have a monster on your hands as this being ages into teens. And that's probably the reason the stupid hippies/uber left kicks them out the minute they can. Kids want discipline. They crave boundaries. They WANT their adults to care. That's why they test...to see how much the community cares to check them up when they go too far.
This ad is just the predictable product of the hippie/rainbow love fest that as yet has not been pulled up short in its overweening ambitions..