As I understand it, SRT requires me, if I'm inertial, to insist that I'm not moving. But why would I do that? In Einstein's example designed to illustrate the relativity of simultaneity he says something to the effect that the man on the train will assume he's not moving. Why should he? He bought his ticket, he felt himself accelerate, and he KNOWS that he is moving with respect to the earth. Why in the world would he assume that he is motionless and that the earth is moving with respect to him? Does anyone do this in real life? Does anyone actually ask (as the old joke goes) the conductor if Chicago stops here?