The main reason: With all these treaties, the world is going to be gradually reshaped into a world optimized for corporation profits. In such a world, humanity and personal rights (of the less than billionaires) are of no value (your value to society is calculated by your bank account and potential to "invest"). Instead of human rights, the "right for profit" for the corporations is established (nothing else are those courts of arbitration, that shall be established for example with TTIP).

When you want to see the end-result: Just watch the classic "Blade Runner" (and open your eyes between the action sequences).