Well. Nobody will agree or disagree about everything. Sometimes people will find agreement. Other times, they'll disagree. The latter most often being the case.
But I look at the conundrum in this way. That it's not necessary that we all agree on everything. That it's only necessary that we all agree that we should all be free. If we can achieve a more firm grasp on what the latter actually means in scope, fundamentally speaking, then I think we'll stand a better chance at changing the course of history in a positive way for everyone. Thats why maintaining, rather than bastardizing fundamental principles of the natural law are so important. These are what define proper man-to-man/government-to-man relations.