How could anyone understand them though? We have very little information on them. From what we have seen in the Lore, books, and games they are presented in a negative light. They do seem very selfish but I suppose they need to be to survive. I just don't think they really have the Argonians best interest at heart. They are making all the other races pissed off. Chiefly the Imperials and Dunmer.
In lore, they're hardly mentioned, save for having nearly their entire home completely and utterly annihilated. In the book, it was mentioned the one in Lilmoth could have been rogue, which it's parent tree was in a previous time. And the ONLY one in the game was forcibly removed, and looked to have been tortured.
As for being selfish, they made the argonians for the purpose of interacting with the outside world. They needed moveable roots to interact with the outside world, and to believe they don't have the best interest of the argonians at heart is an ignorant view of them. Also, the ones you see in Black Marsh are the only ones left, and they seem to reproduce and grow very slowly.
As to why the Imperials would be piss, why? As for the dunmer, the dunmer practically did the same thing to them, and looked to have no intent of stopping. While they would have stopped the raids into Black Marsh, they still were contesting land, and they did fell Hist.