See, the whole rehasing of the OT elements into the PT have ruined the logic of SW. Especially Anakin being from Tatooine; now when Luke is placed there, it makes either the Jedi or the Empire very stupid. In one way Vader could have easily killed Obiwan and taken Luke just by discovering a person named Skywalker there. On the other hand the Empire destroyed themselves by not attacking the Jedi if they were so conspicuous in Vader's mind after the purge. But they must have some red tape on Coruscant if it takes 19 years to build one death star and then only four to build a seond death star at 10 times the cost.