In your view, how much do I think the chicken's life is worth if I would either save it or not save it, depending on factors I can't reliably predict or control? If I would save it one day, but not save it the next? If I would save a chicken now, and eat a chicken later?

I don't take such tendencies to be "revealed preferences" in any strong sense if they are not stable under reflective equilibrium. And I don't have any belief that I should save the chicken.

Edit: Removed some stuff about tendencies, because it was actually tangential to the point.