See, this is what makes it so hard to believe you actually read comics. In the arc Mystique is shown to betray and kill her friends over and over again during the 19th century. At the start of this arc she kills several unarmed villagers. Before this arc she betrayed and attempted to kill both X-Men teams, all underage students at the X-mansion and a baby - not for anyone's good but her own.
But I guess that pales in comparision to half-rape, pushing someone already interested to sleep with the sexy celebrity is practically a crime against humanity.