That is because I differentiate between different types of killing, or different reasons and motives for it.
In the example of the baby, the scenario given indicated the baby would pose a direct threat to my survival.
To me that would be different then if someone just went up and killed a baby because they were bored, or had a bad day, or just because they felt like it.
I do not approve of murder. But as I have mentioned in the revenge thread, I do not view all killing as murder. For me murder happens when an innocent person is killed without any just cause.
To kill another person because their actions are putting your own life in danger I consider just cause.
As to the question about people are insane. The fact that they did not know what they were doing, does not make the person they killed any less dead, and they should not be given a softer sentence for what they have done. Nothing changes their actions and the result of those actions.
As to my being a psychopath, while I do not claim to be completely sane. The difference between me and a psychopath, is that I do actually know the difference between right and wrong, though it is true I have my own code of morals and ethics that does not always agree with societies code. But I would not actually kill another person unless I felt it absolutely necessary to do so.
And the fact that I am actually capable of feeling and caring about other people, though I am not sympathetic to the human race generally. I am actually quite compassionate and caring and loyal to my friends and loved ones.
But it is true, anyone outside of my circle, does not truly concern me.