No one killed Aaron Swartz. He killed himself. He could have become a political prisoner. He might have beat the charges. He would have gotten out eventually. The only cause he is a martyr to now is mental illness.
In modern societies, this kind of thing is fortunately not tolerated, and is usually punishable as murder or conspiracy to commit murder. So what you said is an invaid argument. It remains to be proved that Schwartz was punished unfairly and too much, given his psychological past.