There is a difference between creating laws that deliberately exclude a large portion of a country's citizens (America and South Africa) and laws that as a side

There is a difference between creating laws that deliberately exclude a large portion of a country's citizens (America and South Africa) and laws that as a side-effect make it difficult for immigrants to get jobs (Europe). The citizens of a country should not be subject to exploitative labor practices simply in order to make life easier for low-skilled non-citizens who choose to immigrate.