I am a theif on G2k2, but I'm as fair as I can be about it. After I steal I stay around and fight to the death with whoever I stole from (even if they have four other people farming with them o.O). If they get me to a low amount of health I surrender and offer to give back whatever I stole (sometimes more then I stole). If they still insist on fighting and win (this hasn't happened yet
) I try to find them and give the items back.
If I kill them or they surrender I keep the items and leave.