Because we, unlike lions, are capable of developing a system of ethics, and insisting that others abide by it.
How could you ever tell me it is wrong to kill my children as a male Lion will? What would you be basing your truth on? I could legitimately point to the King of the Savannah as evidence within science that supports my position.
Humans interact with each other in a far more sophisticated way than lions. We can communicate with each other, make agreements with each other, cooperate creatively, in a way lions are not capable of. Our intelligence and our communication abilities in fact probably shaped our behavioral evolution.
We have seen instances where humans will resort to animalistic behavior. The terrorists come to mind.
Remember, it is a monotheistic religion that drives them to that. You can't blame jihad on a belief in evolution - they don't believe in evolution, they believe in special creation by (they claim) the same God you worship.
Our Muslim friends are capable of disagreeing with the ethics you decide upon.
Humans interact with each other in a far more sophisticated way than lions. We can communicate with each other, make agreements with each other, cooperate creatively, in a way lions are not capable of. Our intelligence and our communication abilities in fact probably shaped our behavioral evolution.
And that is why someone shouldn't kill the children that are holding back their gene distribution? A large portion of the male human population is concerned only with gene distribution and the females are just as receptive to the idea. All of these males efforts in life go to contributing to lust. Intelligence has not been a factor in their behavior as they knowingly contract AIDS or the need for a Sharia killing because they raped their sister.
Considering the Liberal domination of our Universities, the higher up the education ladder one travels, the more people are propelled into the same animalistic mentality. So clearly more education can be considered a contributing factor.
Christians also struggle with these animalistic tendencies, however most do not align themselves with it and recognize they need to stop, seeking God's motivation to overcome. I have witnessed the faithfulness of God for myself and many of my Christian friends. They are couples who I can comfortably allow my daughters to spend the night at their house with their daughter. Knowing that they hold highest standards of conduct amongst the members of their family.
Some Christians who evidence that they do not hold themselves to Biblical standards; I am not comfortable trusting. It is the job of the fellow believers to point out to people attending church, Godly standards. Also to instruct these folks in the Word of God on how to approach God for assistance in overcoming their sin. This process is sorely lacking in many churches because of the humanistic relativism indoctrinated by our education establishment.
2Ti 3:16 All scripture [is] given by inspiration of God, and [is] profitable for doctrine, for reproof, for correction, for instruction in righteousness:
If a Christian is known for always filtering life through God's Word, these reproofs can be part of a normal conversation.