How would you know? In any event, as a one-time Republican, I can say with conviction that there would be no need for Libertarians if the Republican leadership would only adhere to the principles to which they give lip-service.
By your reckoning, the Green Party are the Republicans' best friends, since they draw most of their support from the Democrats' ranks. Call us "self-appointed" or "self-righteous" if you wish, but we're just telling the truth as we see it.
Are you really trying to say that those who sheltered runaway slaves were "just lawbreakers"? Perhaps you would then applaud the Nazis who were just upholding the law when they rounded up Jews for the concentration camps and eventual extermination. Or perhaps you would applaud those who might have shot Mormons in Missouri, because the law said it was legal.
I do agree with you that it is wrong, in fact and in principle, to bomb abortion clinics, just as it's wrong to kill unborn children. (Two wrongs don't make a right?!)