I think the issue is quite a bit more complex than a couple of proof texts, but I could be wrong (which I assume you addressed in the posts you mentioned). I also do not believe this is an issue that should effect fellowship.
It is interesting that the only way the powers God puts in place (including America) are generally put there by people (like our Christian Forefathers) who are disobeying the text in question...of course they often create some reason why what they are doing is justified because the previous government is doing something obviously opposed to God's law (taxation with representation ?) I guess we should all be British...actually, I guess we should all be Roman.