My cat is killing my karma

Shawn and I try to do the responsible thing.  Recycle.  Grow a garden.  Rescue turtles from busy roads.  Our cat is systematically undoing all of this.  I know it's nature, but he seems to have a higher than normal bloodlust.  There is a steady supply of dead critters in our yard, mostly birds.  But by far the worst thing is his bloodlust for babies.  Last year he took out a whole nest of robins from their nest. Tonight it was a baby rabbit.  I heard it squeaking though and got to him pretty quickly.  Hopefully, it wasn't just adrenaline that made it hop away.