Even an amateur Christian theologian can tell you that this only refers to unjust death / murder; as the original Hebrew text also espouses more clearly than the English translation (לא תרצח - lo tirtsah, form of ratzach, murder). The Ten Commandments also come from the book of Leviticus Chapter 19 and not just Exodus, and Leviticus 20 onward is well known for the death penalty for several offenses described in the broader Mosaic Law; forming the religious objection that otherwise, God's chosen leader (Moses) himself ordered violations of the 10 Commandments in the very same book.