No, Aaron Swartz was not justified in his actions, because he essentially took things that did not belong to him. There was no reason for Aaron Swartz to do what he did which interfered with the copyright and creative work of others. Swartz intruded, and greatly damaged society by his actions.
Aaron Swartz hanged himself after a plea bargain fell through with prosecutors in his case. Swartz was an Internet activist who was caught breaking into an MIT lab and was illegally downloading articles in a digital repository. He knew what he was doing was illegal and did it anyway. He was caught by the U.S. Secret Service. He knew what he was doing and faced 35 years in prison. Instead, Swartz killed himself. His actions against MIT were not justified since they were illegal.