Remember, I am not here to judge the validity of this passage, just the meaning. Plus, let's not forget that this is an Old Testament passage aimed at the ancient nation of Israel. Without going into a 20 page discussion about the differences between the Old and New Testaments, and Grace vs The Law, let's just say sin is dealt with differently in the New Testament part of the Bible. It DOES NOT say that anyone should be stoned. The sixth commandment prohibits acts of intentional and malicious violence against another person.
Murder is a homicide done unlawfully and with malice aforethought.
The Old Testament sanctions the taking of human life either in battle or as a punishment for a crime. As far as the Old Testament goes, these instances were not the same thing as murder and therefore the sixth commandment was not broken. I don't think that this will be the last statement regarding UFOs as deceptions of the devil. If they are, then let' s prove it. Nowhere in the Bible that I am aware of is there any support to back up Robertson's claims.