I've heard many many stories, directly and second-hand, about Americans who are shocked, no SHOCKED, that there are ever any impediments to international travel. How dare they be required to obtain a Visa?!?!
Brazil is responding tit-for-tat to our requirement that their citizens get fingerprinted. This wouldn't be such a big deal, except for the fact that Brazil is a rather large country and one must travel to the US Embassy to get fingerprinted - in advance.