I think Western modes of state power really is constituted on the basis of propriety. Let's forget the ancient Greeks and Romans and look at today. “When injustice becomes law, resistance becomes duty” only emerged in the last 30 years, and I think this encapsulates the key notion of propriety in Western liberal democracy. “Resistance becomes duty” only when “injustice becomes law” — there's a precondition. That is to say, resistance is justified when the law no longer operates on propriety. When the law operates on propriety, propriety says we have no duty to resist.
Propriety is the ideology that says “the system is broken and must be fixed.” Propriety here says that our duty is to mend impropriety back to propriety. “The system is working as intended and needs to be destroyed” instead looks beyond propriety, understands that propriety itself is the justification for domination, and seeks a way out of propriety.