You are the one making an elementary mistake, I am afraid. Your conclusion does not follow, even if we accept your entire argument.
You have heard the phrase "trust, but verify". It is far too easy to fake transparency and mislead other states. Every state throughout history has done this. At the very least, you need good intelligence sources to verify a state's public pronouncements regarding intentions are sincere. Even if they are sincere, you need to know the intentions/plans/abilities of internal players who may be in opposition.
Although I guess we could just take Putin at his word that he is just conducting military exercises and has no intentions towards Crimea? I'm sure he'll be giving Crimea back to Ukraine any day now.
Advocating covert verification of states' intentions and abilities has nothing to do with government accountability. That is an extreme oversimplification and false dichotomy.