The thought, so far as it goes:
In many "classless", free-market capitalistic societies (and a bunch of similar ones), society ends up approximating social class by the logarithm of the wealth of the person. In these cases "liberty and equality" really mean "lack of government interference in use of wealth", which ultimately translates to government restraint on social status to influence society for your own benefit.
In cases where there's no special laws targeting the wealthy, you essentially have a feudalistic society without any formalized duty of or decorum from the higher classes to the lower classes, which ultimately leads to an exploitative and abusive relationship.
As with many cases in politics, the lack of an explicit structure merely means a more abusive invisible structure.
The further argument is that this is why we should have laws which target the wealthy to provide civic funding/service, eg, higher taxes above say, $250k/yr. That allowing the dynamic class assignment of free-market economies, but formalizing the duty of the higher classes to provide for those under them, provides for the strongest and most resilient societies. Which is generally speaking what the data shows.
Similar arguments can be made about why you should have laws which provide damages if you buy a newspaper and lie about your business rivals molesting kids.