So, we can forbid tourists to wear a burqua, but we can't forbid citizens to wear a burqua?
Who is we Andres? The white population of Belgium? The Belgian people can do anything they please, but banning the burqa may not please a significant part of the Belgian people (quite the opposite). The people of Spain can also do as they please, and if they unanimously don't want bikinis on their streets, so be it.