I agree that there is objective Truth. However, there are many political arguments where both sides are passionately sure that they are right. Do you really want a court adjudicating those and deciding what is true and what is false?
We should be a church oriented moral society and because we are not, (by and large) we are left to our own devices, which translates into the situation ethics of the accepted practice(s) or the court directed behavior dictates ... because you can't legislate morality but you CAN (and they have and DO), legislate behavior
Unless and until we get back to a biblical definition of what is moral and what is not .... the courts already decide our "truth"