I don't do it to piss people off. I do it because their behavior is dangerous and I would like to keep my insurance premium as low as possible. If I can't see, or if the person behind me is putting me in a position where suddenly slowing down would be unnecessarily dangerous, I must slow down to the extent the law allows until I can pull off to the side. Motherfuckers around where I live tailgate like it is their hobby and will do it on the freeway with multiple open passing lanes.