Is there any proof the counterfeits are prone to catching fire or anything like that? They didn't go through consumer testing, but that doesn't by itself mean it's unsafe. Granted I wouldn't trust it with a ten foot fireproof pole and they should be taken off the market.
Well, from Apple's point of view, they quite rightfully don't want anyone to sell products calling themselves "genuine Apple" products when they are not.
If it's a fake, the manufacturer has already demonstrated that they are quite willing to break the law by violating Apple's trademarks and misleading their customers. I think this is different from fake Gucci handbags where the customer _knows_ they are buying a fake, and they just want something with Gucci printed on it - I don't want a charger that has "Apple" printed on it, I want one that is safe and works. I bet Samsung (ignoring their recent debacle) could make chargers that are 100% compatible with Apple devices and 100% safe, and if they were cheaper than Apple products they could sell a lot. If they did, they would probably be copied as well :-(
So when this manufacturer is breaking the laws anywhere, why would they care if their charger is safe?
The actual problem is that making a charger that is small and safe is slightly difficult and slightly expensive. If I was in China, I'd build a charger that is big, safe, and works, and try to sell it for half the price of an Apple charger. And advertise it that way.