Genesis 9:6 and Jesus' Silence in the Face of Roman Crosses

How do you reconcile Genesis 9:6 as well as Jesus' silence on the subject of crucifixion with it being as you call it a "moral abomination". This phrase puts it with abortion and euthanasia where it doesn't belong. Also one would have to consider a good portion of the bible and God's punishment of the wicked as morally abominable, wouldn't one? Disagree fine. But to use such a phrase for capital punishment (don't forget the criminal, to warrant such a sentence, has murdered someone) undermines it for what it really applies to.