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The reality is that there is a cost to someone for everything that is dug out of the earth, smelted, burned, refined, etc. It is also reality that there is a constant balancing of the scale as to what steps we are willing to take to minimize those costs. For some, emission controls on coal burning power-plants is too much of an expense, for others exploitive labor is another way of saying “those people” will work hard for low wages. So while conflict minerals are a valid concern, there are many other concerns as well, and many of those affect a greater number of people directly. It may not be just, but I do not see a strong swell of consciousness among the general population when it comes to conflict minerals. I am glad there are people that care, and care passionately, but frankly they are a small percentage of consumers,
To be fair to Nintendo, the company does have guidelines that prohibit use of conflict minerals for companies that manufacture their products. I have no idea whether the contract manufacturers actually follow those guidelines, but they do exist. As a Japanese company, Nintendo operates under different rules and transparency requirements that American companies, so it may also be difficult to directly compare the effectiveness of their anti-conflict mineral policy