I say this with all due respect to every participant in this thread: I do not see the point in splitting hairs over statistics.
Whether 1 out of every 5 women has been the victim of sexual assault, or it is really 2 out of every 5 or it is really 1 out of every 10, we have a problem. And people believe that we do not take that problem seriously.
Maybe we are missing the kinds of leaders who can humanize the issue. We seem to treat it as an issue of male-dominated law enforcement agencies, male-dominated academic institutions, a broken justice system, and misogyny, among other abstract things. Maybe we are missing somebody like Martin Luther King, Jr. to remind us that we are failing humans who are deserving of the same dignity and respect as all other humans. Maybe we need somebody to remind us that we are not living up what is written in many of our constitutions.
A good start might be to stop making it a women's issue, a prisoners' issue, etc. Maybe if every victim of sexual assault--male and female; heterosexual and homosexual; rich, middle class and poor; black, white and Hispanic; urban and rural; famous and common; young and old--developed a sense of solidarity and did something like the 1963 March on Washington then we could no longer deny that we have a problem and no longer do nothing to correct it.