How Luke Killed Everyone
Luke Skywalker killed his mother, Padme Amildala. She was doing okay giving birth until Luke popped out and she saw the ugliness of him. So distraught that her own child could be so ugly, she simply lost the will to live.
Luke Skywalker killed his uncle and aunt, Owen and Beru Lars. If he had not suggested that they by R2D2 then the Empire would not have traced him to the Lars homestead.
Luke Skywalker killed Obi-Wan "Ben" Kenobi. When Obi-Wan was battling with Darth Vader Luke called out, "Ben!" in the midst of their battle. This caused Obi-Wan to look and distracted him from the battle so Darth killed him. It was all Luke's fault.
Luke Skywalker killed Yoda. If you notice, the first time we see Yoda in "The Empire Strikes Back," he seems to be full of life and vigor. How could a couple years make such a difference? Well, Luke tired old Yodes out! If Luke had not been such trouble and so tiresome to train, Yoda wouldn't have gotten sickly and died.
Luke Skywalker killed the Emperor. If Luke had not been such and bother and so resistant, Emperor Palpitine would not have gone ahead and zapped him with Force lightning! Thus, making Darth Vader angry and throwing the Emperor of the balcony.
Luke Skywalker killed his father, Anakin Skywalker. Even though Darth was a little beat up from being zapped by the Emperor, he would have been all right. That was if he hadn't asked to see Luke with his own eyes. Once Anakin took off the helmet and saw Luke with his own eyes, Luke's ugliness was too terrible to behold! Anakin was scared to death by his own hideous son.
So you see, Luke has successfully murdered not one but SIX people! Probably more that I couldn't think of. Whether it was by his atrocious features or his annoying and stupid personality, Luke Skywalker is dangerous. And proved so here.