They were still pirates. Providing a patronising google link doesn't change anything. It's basically the same attitude that the US government has today with their foreign policy -- "f**k the rest of the world because we've got the biggest guns".
I don't think "pirate" means what you think it means. Pirate is not the word you're looking for. Probably "highwayman" is a better fit. But even that doesn't work. After all, these roads started out as toll roads. The land was either unowned or legitimately bought. The money to build it was raised voluntarily. So where's the "piracy"?
Let's compare, shall we? When a government wants to build a road, they use "Eminent domain" or similar methods of expropriation to get the land. And they don't take no for an answer. And the money to build it? Yeah... they don't take no for an answer on that one, either. Now that's highway robbery.
Those Native Americans could not show title to the property, so why not take just take the land?
I'm part-Native, and it never really worked that way. It's not rational to consider ALL of the early American wilderness to be "owned" by the tribes that hunted it or lived nearby. Even if it were, there were a number of different tribes that could have competing claims to ownership of thousands of arces of unmolested wilderness, and they resolved their competing claims in exactly the same manner. The Eastern/coastal tribes were (generally speaking) no more nomadic than the white Europeans, and built wooden clan sized homes & farmed. There is little evidence that the early colonists did not respect an "indian" claim to ownership of an obviously cultivated area. Those tribes did not believe that a natural & undeveloped area could be "owned", so in a sense they defaulted naturally to the ancap theory of ownership in the sense that it was the labor involed in clearing the forest & constructing the highway that made that real estate "ownable" to begin with. The concept of 'homesteading' a wild area that has no obvious (living) prior claim to ownership is based upon a similar theory, and led to conflict with the western (nomadic) tribes; who generally believed that property is owned collectively & that a tribe could possess an extended & exclusive territory well beyond the region immediately near any improved areas. So even by their own concept of ownership (which is obviously different than our own today, and different than those of the Western tribes) the Eastern tribes had no practical complaint concerning this highway or any other until they were denied safe passage upon those roads. But that was a completely different issue.