The South African filmmaker Neill Blomkamp gave Hollywood a jolt of creative electricity with his 2009 debut, "District 9," an inventive and wickedly funny parable about space-alien apartheid on planet Earth. His disappointing follow-up, "Elysium," tackled two not-so-sexy issues -- immigration and health-care reform -- with such simplistic thinking and contrived storytelling that it seemed to come from a different director.