Countries like Italy (in particular) see their south american diaspora as part of their economy, and encourage them to return to counter-balance the general immigration of those with non-italian ancestry. An Italo-brasilian, or Italo-Argentinian getting a passport and living in the E.U. is not unusual, but just when it is applied to football, or other sports, it's considered either cheating, on behalf of the country, or betrayal on behalf of the player: Deco for example is not well liked in Brazil. I don't think however, that Italy or Spain or Portugal having South American born players is any different to most of the French team originating from their colonies, the difference is only in how the french held on to theirs.