I don’t want to disregard science. I want to err by being preemptively more inclusive, not more cruel, when I don’t have sufficient information.
If you don’t have any evidentiary basis for your inclusiveness, then that makes it completely arbitrary. Why not start worrying about potential cruelty to non-living things like air, or rocks as well?
Because, as you say, they are non-living. What is and what isn’t life is not arbitrary. It’s a distinction based on science.
Why does it matter? We can’t understand the subjective experience of rocks any more than we can bacteria. Why should we rule out their capacity and not bacteria’s? There’s no more evidence that one has more of a conscious subjective experience than the other, living or not.
By your logic, shouldn’t we opt to be more inclusive of rocks if they could potentially have some sort of experience that we have no current understanding of?