Near slave labor exists in SE Asia because the national governments in that part of the world are willing to tolerate it. There are plenty of countries with free trade agreements that don't have poor working conditions. Near slavery is not a necessary consequence of trade deals -- it is a consequence of bad government. It existed long before free trade agreements.

Similarly, resource exploitation occurs in countries whose governments are willing to allow their resources to be exploited. It happened hundreds of years before any free trade agreements were signed, and it will continue to happen until those governments change their practices.