Well, of course, we know that rules are actually necessary in everyday life. In the UK, where one drives on the left-hand-side of the road, it would be a very foolish person who insisted on the freedom to drive along one of the motorways on the right-hand-side! Likewise, in a game of, e.g., hockey, there are rules. If 22 people went on to the pitch, and just started hitting a ball (and one another?!) around with wooden sticks, that would not be a game, it would be a disaster! In something less 'physical', such as music, each note - minim, crotchet, quaver, etc. - has a specified length, as do the 'rests'. There are also different keys that use specific notes for the piece of music being played. However, if every musician in an orchestra was allowed to decide for him/herself the length of the notes, and the pitch of each note, what ensued would not be harmonious music, but a terrible, discordant, mess!
So with life. We need rules! These Ten Words are among the most basic that we know, and most law-codes are based upon them, or on something very similar. They make perfectly clear that, as the apostle Paul wrote to some fellow-disciples of Jesus: "... all have sinned and fall short of the glory of God," (Rom 3:23). A modern evangelist, Ray Comfort, makes this clear by the simple questions that he asks people with whom he speaks - and he speaks with a lot of people! He makes it perfectly clear that each and every one of us (that includes you - and me!) has sinned against Almighty God.