So a group, say, United Statesians elect a lying fool to act as chief executive. He puts naysayers at the head of every department, eliminates executive actions by his predecessor because that predecessor was of darker hue and for no other reason.
In effect subjective lawmaking.
So are laws objective or are they subjective commerce?
If they are subjective commerce then how can one come to the conclusion that morality is other than objective?
This question turns on the notion that laws are objective things.
It's all in the fine print. The definition of "law" differs according to application. We have "natural law", or we did at one time. I'm not sure the term is still used, but The Laws of Newtonian Motion were based on natural law. They seemed objective, and were by any understanding, until Einstein came a long and pointed out that our experience with gravity was actually a special case of a very small body(us), very close to a really big body. What we experience on Earth, is subjective and may not be the same if we were drifting in open space.
I think the desire for objective morality is the ultimate appeal to authority. A religious person can defer to God, when authority is needed. The lack of moral objectivity puts the individual truly in control of their own actions. Fortunately, most people can go through life without suffering a great moral crisis, but when it occurs, one must decide between what is prescribed by the current morality, or defy it. The social sanctions which are applied to the immoral must have broad support. When people no longer feel any particular act is a threat to group security, there's no motivation to do something like stoning an adulteress. This is how moral codes change over time.
Morality is a reaction to the environment and environments change, both through natural processes, and by our own efforts. It may take a while, but when conditions improve and death, either by starvation or marauding hoards, is not likely, we can loosen up a bit. This might mean treating women as humans and not property, or distributing resources so that fewer people go hungry. There's nothing objective about any of that.