The fact that, if sweatshops are allowed, sweatshops will be the best option people can find, does not entail that if sweatshops are not allowed, the best option people will be able to find will be worse than sweatshops. This is because markets are not magic, and the conditions of employment don't come 'ex nihilo', but are rather a function of (amongst other things) what employers are able to offer; so, changing what employers are able to offer changes what alternatives are available.
'Able' here is a complex thing; to look at just two countervailing parts, how little can employers get away with paying, but also how much can they afford to pay?
If the sweatshops do more than break even, then the employers can afford to pay more and have better conditions for their employees - but they won't if sweatshops as they are now are legal, common, and accepted. Most sweatshops do a lot better than breaking even, so if we got rid of them, a better alternative would be able to exist. (If you believe in General Equilibria, a better alternative would be forced to exist).
'Able' here is a complex thing; to look at just two countervailing parts, how little can employers get away with paying, but also how much can they afford to pay?
If the sweatshops do more than break even, then the employers can afford to pay more and have better conditions for their employees - but they won't if sweatshops as they are now are legal, common, and accepted. Most sweatshops do a lot better than breaking even, so if we got rid of them, a better alternative would be able to exist. (If you believe in General Equilibria, a better alternative would be forced to exist).