The claim that the US is the most violent empire ever is patently untrue, even in raw numbers. In raw numbers it still shows very poor historicity & statistical understanding.
The Romans were less violent because the world's population was less than a twentieth of today's? Uh...
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I'm not fond of US imperialism, but I'm pretty sure I wouldn't prefer it to, say, Mongol imperialism.
Even British imperialism may have been worse.
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Every empire ever, even so-called "trade empires", massacred people on their frontiers.
The US has been getting steadily worse for decades, but we're nowhere near peak evil in a historical perspective.
If you think this is as bad as it can get... tssh.
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Cheerfully, the US is one of the least evil of the five or six other empires that could have formed out of WWII (barring some unimagined possibility).
Economics of scale are not kind on stuff like this. Very, really, fundamentally not kind.
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All of which is to say, it's impossible and hubristic to try these claims.
The US doesn't need to be the most evil empire, like, ever, to be considered a problem. This shouldn't be difficult to understand. The consequences of thinking that's true... are more insidious.