I watched that really good YouTube video on pirating but I have a few questions... how to get an npc to go away after u break there cargo hatch? Why is it hard to interdict in the cobra? Where are all the people?
I don't think you can, at least I've not managed it. Right now NPC Pirating doesn't really work, you can mug a T6 or T7, drop their shields in seconds and Hatchbreak them, but they hang around doing small pew-pew damage to your shields and killing your collectors rather than running away (they're hideously accurate vs Limpets it seems). Also, NPCs carry mostly junk.
So right now you have to kill them or their drives, and let's face it most trader ship die before their drives fail...so you have to kill them, which isn't really Piracy IMHO. Pirating the Pirates works better, as you kill then for the bounty anyways and they have better stuff in their holds.....it's a funny old galaxy.