it's not. outside of the U.S. there are numerous situations that would require you to have a second passport - the one I hear the most are people who travel int

it's not. outside of the U.S. there are numerous situations that would require you to have a second passport - the one I hear the most are people who travel into Middle East countries but require them also to to Israel. You can basically branch off from that situation to other "real" situations.