G'day Prasad,
I checked out WP:DRVU and I found that the following userbox templates had been deleted:{{User Unamerican}}, {{User independent Iraq}}, {{User USA police state}}, {{User Communist}}. Now after checking some of the comments on the discussion about {{User Unamerican}},it seems if a user is {{User Americafan}}-i.e supports America he does not have a POV, however if he does NOT support America he has a POV. Now whether a point-of-view is good or bad isn't it (logically speaking) still a point-of-view? It's small things like this that (despite there being numerous fair American Wikipedians) make it seem as if Wikipedia is biased toward the U.S.
Users are allowed a POV, they aren't allowed to express one in articles.
"Divisive or inflammatory" userboxen are being deleted every day; it's easier to make the case that "I hate X" is divise or inflammatory than it is to make the same case against "I love X". That's the reason for the perceived bias.