I want to use the term “objective” in the sense that the reality of a thing is there whether you like it or not.
Let’s consider Jane. Jane wondered across some land and decided to live there and farm it. She never purchased the land and has never considered whether it’s right or wrong to farm the land. Bob arrives and shows her documentation proving he owns the land and tells her to stop farming it.
Has Bob introduces an objective source of right and wrong for Jane to consider?
I can picture it. As Jane wanders across the land she looks up in the sky in wonder, and probably is not that aware of ordinary things around her. But, also, she has been a little scatter brained in some ways, and is also homeless, and needs a place to live. Funny enough, she has some books in a backpack. One of them is a book on Georgism, which she had learned years back.
(
Georgism - Wikipedia) She kinda knows on some level that the air, the water, the land, the sky, they belong to all of us, all of humanity....
Ok, she's idealistic, but she can also read. Let's think what could happen then...
Jane remembers about Georgism and tries to teach Bob, and then he might or might not be humble enough to learn about Georgism. If Bob learns about Georgism though, it might not convince him to share the land, but instead he might make up rationalizations that seem quite rational, and he tells Jane some bad thing like
"We are simple people, and we really don't feel we can welcome in all strangers, so we feel like you should move on."
Or...maybe instead Bob is vaguely Christian, and something quite different could possibly happen....
Suppose Bob remembers some things Christ said, instead.
What if that first few days, before evicting Jane, Bob pulls down the old dusty bible he hasn't read, and opens it to a gospel and starts to read. Then, something happens, and Bob starts to remember some things Christ said to us, and finds them.
Later, Bob says to Jane:
"Welcome here. I was wrong to tell you you can't stay. Martha and I would love for you to become our neighbor. If you could just help with the hogs and chickens, and maybe help Martha some in the garden, we'd love to have you live here with us."