The phrase the "USA always gets its man" is not really true, is it? Assange just walked a free man and they fought tooth and nail to get him for nearly a decade and failed. They also didn't get Snowden, who still lives a free man now and at the courtesy of one of the USA's greatest enemies.
Yes, they got other high priority US targets like Bin Laden, "El Chapo" Guzmán, Noriega, Saddam Hussein and a few others in the past. But my point is they win some and lose some. Success depends on various factors, including international cooperation, legal frameworks, and the specific circumstances in each case and, thus they don't have the sweeping powers across the world that they would like the rest of the world to believe, which is that they can capture fugitives anywhere.
This false belief seems to also have derived from the mindset of American exceptionalism. The belief that the United States is inherently different from other nations, often viewing itself as a beacon of freedom, democracy, and justice, but yet that also isn't really the case. And this ideology can extend as far as to the false belief that American institutions, including law enforcement and intelligence agencies, are uniquely capable and effective in always achieving their agendas.
Outside of its borders, the USA is viewed very differently though, far more realistically and much more objectively. But inside the USA the brainwashing is sadly still very strong for many.