Dogtooth

I must confess that I didn't understand 'Dogtooth', a film that has been billed in some quarters as a "satire"; but I fail to see what it is supposed to be satirising. A couple raise their children in isolation from society, and feed them a diet of false facts about the world; in apparent accordance with their parents' desires, the children grow up with a highly unusual set of behaviours, morals and perceptions. The false picture painted by the parents is frankly bizarre, but their offspring have no external knowledge by which to judge it. But I never got any sense of what motivates the parents to behave themselves in such a strange manner, and they seem to live a similar, fairly joyless existence to their kids. Presumably this film is meant to be about something; but to me, it just felt like a pointless oddity.