Mueller has the protection of The Mob (The Democrats and the Media). If he hints at something, it becomes front page news. If he was wrong, it gets covered up.
That makes him dangerous because anything he finds gets blown into a scandal.
They’re realizing they don’t have this power anymore though. They tried to apply criminality through insinuation and it’s failed. They have nothing because the hacks are actually leaks. Now they’re trying to shift to Facebook ads. It’s a joke.