You have to leave it as good as you found it, doubly so if you're tending to friends family or nature, and never stop trying to make things better for one(s) you love.
This means if you don't put your cart away at the grocery store I'm giving you stink eye.
I think we're all too tired, over worked, and taken advantage of to truly embody the above philosophy, so I let most people off the hook.
That said I think morality is a natural trait/occurrence of any living group, to be part of society is to contribute to morality, and to behave immorally within the context of a society is to not uphold the values of that society. Immoral isn't inherently/naturally wrong, it's just incorrect to the people you're attempting to exist with.
If anyone claims to exist without morals they are just claiming to have different values to what their community finds important, and would probably benefit from finding community that aligns with their beliefs, but that risks extremism and echo chambers, see also the Internet and federated instances.