It isn't extreme to think that someone might abuse the power to break the law with impunity in a nation where, just a few short years ago, one of the candidates for the highest office in the land incited, willfully, an armed assault on democracy and other officers of their government in direct violation of the oath they took when they assumed the mantle of the presidency.
In fact, it would be incredibly naive to believe anything else. Chief Justice Roberts doesn't even believe what he is saying; he's only mouthing nonsense to try to distract the people of America from what a card-carrying Batman villain he is.