The attempt to protect one person against violations and assaults can result in a violation of another individual's human rights, particularly in an atmosphere of hysteria, where collective rather than individual emotion and a crowd mentality begin to inform the perception of reality.
It seems that when we look at Don Giovanni, what we see are our own cultural obsessions peering back at us. In the late 20th century, we began to see Giovanni increasingly as a man in existential crisis.
Don Giovanni was a womanizer -- one beside whom Don Draper would pale. But it was not this Don's philandering, but the way in which he held himself above God and all morality that shocked Mozart's audiences most.