I'm a bit confused, in that the principles contradict each other. This is in itself isn't a problem, since vigilante groups have a habit of that sort of thing.
However, ensuring both a fair trial and human rights as well as executing people that don't live up to these standards might be very awkward for you, since a fair trial would probably require a judge and jury, which you won't be. If you only execute people after a fair trial, well, you're not doing your cool vigilante thing.
If you're attacking smugglers outside of Barrier Gate, you can't make them have a fair trial, since, effectively, drugs are legal there and you can't take them to court.
Less fair trials, more sticking the boot into peoples' teeth.:)
Then again, leaving the contradiction could be interesting and create opportunities, but I see this as possibly causing unfun confusions.