Oh for God's sake. Trying to act like I don't even want South Americans to have their own countries is the worst kind of straw-man building.
But when you have a power that is getting tighter and tighter with Iran and doing so for the direct purpose of opposing the United States (and let me remind you that Iran is not only pursuing nuclear weapons but is already a state sponsor of terrorism), and is forming ties with other nations in South America to encourage that attitude, you DO have a potentially very serious problem if Chavez and his allies are able to wield sufficient power through this alliance that moderate powers as regards relations to the rest of the world like Colombia end up being shunted aside.
It is not inevitable that it would go this way, but it could, and we have to be watching for the threat should it arise.
It's not a straw-man argument; it's how what you're saying comes across. The South American nations have a long history of being controlled and interfered with by the United States, and UNASUR represents one of their best chances to establish themselves on the world stage as truly independent nations. Attacking UNASUR out of a premature fear that Chávez will turn the entire continent against the U.S. really does come across as being akin to being hostile to the idea of the U.S. no longer controlling their governments.
Do we have to watch out to make sure that they don't become a threat? Of course we have to be watching. We have to be watching
everything; I'm sure that the U.S. has people in Canada whose job it is to make sure, just in case, that the Canadian Forces don't try to invade.
But let's not sit here and act like Chávez represents mainstream South American opinion, and let's not act like that's a
likely potential threat. Venezuela is a diplomatic problem, certainly, but, 1. Venezuela's power is waning due to the economic crisis and the lower costs of oil, and 2. a
hell of a lot of South American governments do not go along with his foreign policy at all, especially after this recent crisis in Honduras and all the allegations that he's funding FARC in Colombia.
UNASUR is no more likely to become a threat to the U.S. than the African Union.
ETA:
And let's not forget this, either:
The easiest way to turn someone into an enemy is to assume that they have hostile intent. The easiest way to convince the Union of South American Nations that they should be hostile to the U.S. is to assume that they're a threat. The easiest way to create a problem is if we assume that the Union of South American Nations equals Hugo Chávez.
It is only by reacting towards UNASUR with rational, proportional responses, and not by assuming that they represent a threat simply because they haven't thrown out Chávez, that we can make sure they
don't become our enemies. We have to be realistic and remember that while anything is possible, not anything is probable. And South America becoming a serious enemy of the United States is just not all that probable -- especially considering how many of them depend on the U.S. for trade.