They are pissed because they want Trump to weaponize the situation against his political enemies like he does with literally everything else, not because they think hes guilty or covering it up. Trump could release a list in his signature sharpie handwriting that has just democrats on it and theyd accept it as fact, demand retribution, and swiftly move on. They are frustrated because they cant process why Trump, whos such a master genius in their eyes, has failed to do anything like that so far.