Had they stopped at the tutoring, nobody would have a problem with it. It's when they started to hurt other (poor) people in order to advance that the situation turned to shit. Of course had the movie stopped at the tutoring, it would have been a boring movie. It's taking the situation to the extreme that makes it an interesting movie. I really hope that in real life, such a family would be happy to have their kids in cushy tutoring jobs and use that windfall to improve their situation.