I tried to ethically do it and rolled a character on a different server (to defeat your enemy you must know your enemy). I know that doesn't help you in this instance.. but not being a big MMO guy, this is probably the first time that I haven't played any adversarial FPS against TOG. I have no problems shooting another TOG in the face, it's what I've always done up until this point.
If your TR character isn't something like LazarusProjekt, shoot first, take names later. I wouldn't want someone on the other team going soft on me - because I'll be bringing all I've got to take them out.