I think once one begins to behave in a way that devalues a life, lion or man, and sees oneself and more valuable/valued than another living creature, human or otherwise it is a downward spiral for us all. We feel bad for this lion, lured to its death by someone who gets some pleasure from harming it. We don't appear to get as angry when we see an African child dying or do we?
Do you think we have got so angry about it because we see it as a slippery slope ..if you can kill a beautiful animal could you kill a person that does not fit your image of 'someone like me' ?
I do not know the answers, I am just asking.