Sorry...not trying to be difficult here, just find the topic interesting. Let me present it this way:
In the United States, there is a Constitution. What that Constitution says is pretty plain. However, interpretations of that Constitution have changed over time. Even when the words remain unchanged, interpretations vary depending on the standards of the particular generation that is interpreting them.
Same thing with the Ten Commandments. Yeah, you'd think it would be pretty straight forward and simple; but if you study Jewish history, and Christian history, you will find that actually they've been interpreted in a wide variety of ways, by a number of different people. Sometimes interpretations were 'forced' by leaders who sought to use them to justify various actions. Sometimes interpretations simply evolved and changed as the society that was using them evolved and changed.
The problem isn't the Ten Commandments. The problem is that there are, in fact, numerous ways to interpret them (even though it would appear it should be straightforward). The question of "Does it say thou shalt not kill, or thou shalt not murder", and what specifically do the terms "kill" and "murder" mean, is just one of many, many other questions and arguments that have been raised.
In the end, the Ten Commandments don't determine what society does; it is society that interprets the Ten Commandments, and decides what they mean within their particular context.