It seems pretty obvious this person is a troll. He or she is just using the "See, I agree" argument of disarming - which is the hallmark of liberal dialectics.
In it's classic form it appears as a 'but' statement: "I agree we have the right to bear arms [lie] but since tens of thousands of children are murdered by guns every year [argument to emotion], firearms should be banned [true opinion]."
Furthermore, I'm sure the IP addresses of all posters are logged and if a repeat troll has a static address, you just ban it right off the bat.
That's the primary way the phrase "Returning Troll" makes sense.