Some similar ideas exist between passing the blame to parents and retailers.
I am actually a proponent of not selling guns to anyone, specifically because it's easier to do harm than to do good. But people will indeed sell guns and there isn't much I can do about it, and if people don't sell guns, then that market will go away, and thereby reduce the total amount of buying in a country, which will in turn make countries become more poor, and having more black market goods available. In other words, bad things. So, I can't blame retailers. Deciding not to carry certain games because of a faulty rating system that will sell if they did carry them is dumb.