You can believe in the power of a legal system without respecting the specific legal system that you're currently living under.

Would it be a disconnect to illegally oppose an immoral law - like, say, the legal protection of slaves as property - while simultaneously wanting to pass laws that you expect people to follow - like, say, making slavery illegal? Probably not.

It's inaccurate to treat obedience to the law as a moral act. It can only be moral because the law itself reflects moral attitudes. Wherever there is a disconnect between the law and morality, it is the law that bends - which is exactly why laws can be rewritten in the first place.