That's what I have problems with! D=
I look at someone die in front of my face, afraid to be called a KSer but also worried about letting that someone die. That's why I think clerics have an advantage sometimes. Heal them, and that'll be fine, or buff them if you get to the level.
I always try to help out someone, sometimes they'll say thanks, other times they'll say please stop KSing.
But the people in MT are generally nice. Today in MT I had to say thank you about twenty times for getting buffed, healed, and dispelled xD