Drivability of a Volvo with a broken trailing arm

I have a 1999 volvo S80 with a broken left rear trailing arm. My car does not make any loud clanging noises when it is driven, and can be handled except in the rain. I have been told two different opinions, one was not to drive it that it was really dangerous (Ive been driving it this way for awhile because I didnt know it was broke to begin with) and the other was its ok to drive because its just there for stability. What do you suggest?