By that statute, the US government became a terrorist organization the first time they made a military attack on a civilian function -- hitting a wedding with a drone strike, or taking out a US citizen and his children together because it's too much bother to go arrest him.
A head of state/commander in chief is a legitimate military target -- whether your weapon of choice is a long rifle, a laser guided bomb or weaponized satire (he really DOES resemble Gollum).
If you are using asymmetric warfare against legitimate military targets, then you are a freedom fighter no matter what the people you oppose call you.
If you're attacking civilian targets to scare those civilians you didn't attack into doing something different, then it doesn't matter what you call yourself -- you're a terrorist.
George Washington did both in his life. The US government routinely commits acts of terrorism -- the only difference between a drone strike on a wedding and the 9/11 attack on the World Trade Center is that the drone operator lacks the courage to put his own life on the line for his convictions.
Blending into an innocent crowd doesn't work so well when the government doesn't care if they have the right warm body in a cell, just that they have A warm body in the cell.
And when they're willing to fill a hundred cells with innocent warm bodies in hopes one of them will be the right warm body, such tactics will backfire. I'd say hilariously backfire, but it's not funny at all to the other 99 people.
It is a fact of federal law (statutory) that if a US citizen violates US law while outside of US jurisdiction, they can be prosecuted for that violation when they return to US jurisdiction -- even if what they did was not illegal where they did it.
The US Constitution does not have territorial limits built into it, those have been created by the courts. It is a violation of federal law (Title 18, Chapter 13, Sections 241-242) to violate the rights protected by the Constitution (as well as statutes) under color of law. Doing so alone and unarmed is punishable by a year in federal prison. Doing so with two or more people or with the threat of a dangerous weapon involved increases the punishment to ten years in prison -- a felony by the standard both state and federal governments use to determine such things.
Federal courts and many state courts have ruled that mere possession of a dangerous weapon while committing a crime -- even if the victim never knows the criminal had the weapon -- adds the with-a-weapon enhancement automatically.
Tl;dr: Every time an agent of the US government acts like the Constitution doesn't exist at the border, they became a felon -- but the government didn't see any need to prosecute itself, and ignored the crime.