So if it's normal to torture people in some cultures, will they allow that too? If some cultures allow you to steal or rape women, is that ok too?
Is it not the responsibility of an enlightened culture to draw the line and say, "some practices are simply wrong"?
Since children are unable to defend themselves or make an informed choice about such matters, this is a blatant violation of their intrinsic human rights—and Finland has gone on record as a truly backward nation.