"But we still trade with other countries," Spitfire pointed out. "We've already seen that Mareitania's Shades are more than capable of operating outside of their country, so they could plant those gems in their trade goods. Then, when they're found, ponies would be drawn to the gems, or what they're hidden in, and would want to take them home where their friends and families would be affected. They'd start supporting Faust, and would turn against us. In fact, given enough time, Faust could turn the entire world against us."