Does Dark Pool violate the fundamental principles of transparency

Does Dark Pool violate the fundamental principles of transparency in stock trading? We used to read about the Stock Exchange querying companies on unusual movements of their stock prices and trading volumes and demanding to know why. Would these be a thing of the past when secrecy and non transparency are being advocated? Would the stock prices reflected in the stock exchange a real indication of demand and supply when real buying and selling are not done in the exchange? Would genuine small investors be trading on prices that are not a true reflection of real buying and selling interests? Are information being held against them while some organisations are privy to information that posed an unfair advantage similar to insider trading? Would transparency be a thing of the past? Level playing field?