It’s very true, that psychos who harm humans very frequently get their start by tormenting and killing animals. Something is seriously missing in any human being that can inflict pain on another living creature.
The subjectivity of morality does pose dilemmas that reasonable minds can equally disagree on.
For example... If my dog and Hillary both fell through the ice of a frozen pond and I only had time to save one, despite what all my instincts told me to do, I would pull that old miserable bitch out first.
Then I would wait on the shore with her keeping her warm until the police showed up to fish out the former Secretary of State.