When I get the trade good galactic privateer the enemy A.I wastes 3-6 turns trying to attack my now unkillable trade ships before taking a break for 2 turns only to reaquire them, argh. So in the next patch could something like the following be added for each playing race, ta.
IF CIV5 has G.P. ignore CIV5 trade ships with a dedicated trade route ELSE if time/resources/location permits attack the mofo