This argument never convinces me.
Firstly, not all rules are equally valid. Some are useless, inconvenient, or actually actively harmful.
Secondly, when people don't think there's a lot at stake, they bend the rules or don't follow them, because why should they? There's not a lot at stake, not following the rules often makes more sense/convenience than following them, the chances of anyone getting hurt is remote.
For more serious stuff, like murder or arson, well most people agree that they are Bad Things that cause far more harm than good and pretty much everyone follow the rules that reduce or prevent their occurrance.
A well-functioning society can be measured by many different ways and strict adherence to the rules is one of the least useful ones IMHO.