He probably didn't think it was all that different to what was going on around him in the high echelons. But you forget the horrific emotional damage rape causes its victims. That's why it must be severely punished, no matter where it occurs and certainly when it is perpetrated by someone who is supposed to be representative of a country and thus a role model to those living in it.
13-year-old dies for unknown reasons in Kiryat Tiv'on near Haifa (Haaretz)
from the article: Former President Moshe Katsav gets 7 years in jail for rape