*Cough* Taris *cough*
The argument is that if a power BLOCKADES Nar Shaddaa, as has been suggested for Traya with her garvity well things, then there'll be backlash. Smugglers can't make credits off the biggest underworld market in the galaxy if they can't leave or enter Nar Shaddaa. They're not gonna sit by and lose money, influence, and favor with the dangerous gang leaders they work for. Trying to interupt the business of the underworld has never ended well for anyone.