Too bad you forfeited your right to pass moral judgment against slavery, a sin against human liberty, by demonstrating your reckless approval of indefensible and truly vile acts of murder, a sin against human life which is thus more grevious in its effect than one that merely deprives liberty.
If you want to skip around on some moral high horse over slavery then prove you have that right by retracting your endorsements of Robert Milroy and his and other acts of pure evil comitted upon southern civilians. Otherwise you have no more moral credibility than the partial birth abortionist who protests the "immorality" of capital punishment, or, put another way, your senator.