My Stellaris alien race is kinda ideal tbh.
The Photecians, from Otharia.
Egalitarian, Xenophile, Spiritualist.
Natural Sociologists, Communal, Charismatic, physically Weak.
Idealist and Environmentalist
Follow
they see nature as sacred, but have a wide definition for nature. They try to co-exist where they can, and don't hold sapient life over non-sapient.
Of course they aren't fanatic about it, you can't go through life without killing bacteria or eating, that's part of the cycle too and they're all in animal bodies. But they build with nature, hybridized.
There are many drugs associated with their religion, and they experiment freely to know what it is to be other lifeforms
If living were as pleasant as possible for everyone, the maximum possible good in this existence can be achieved. That's their mindset. But again, they are not fanatical about it. It's just a tendency.