As I see it, anything goes outside religion. No one yet has been able to explain to me how a system of values could exist outside a religion.
"A man's ethical behavior should be based effectually on sympathy, education, and social ties; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death." - Albert Einstein
Why should America not exterminate Muslims and all others outside America as a threat to America? We don't know these foreigners (exception being the few Muslims in the US.)
The only reason I can see is that Christianity tells us such is wrong.
You need Christianity, I need only reason and sympathy to know the same thing. Besides, even if I felt no sympathy, the society has laws to follow. These laws also tell that it would be wrong. No need for religion. Btw have you heard of natural laws and natural justice?
What does it matter if evolved pond scum suffer? Why should we listen to one hardwired emotion that tells us to care for our own more than or less than another hardwired emotion that provides us empathy for fellow humans? Imagine living in Israel or Iraq where each side is viciously murdering the other and where such thoughts would be prominent. For some, extermination of the other seems the only way to protect their own.
If you haven't figured out, it's the most religious of them that are the most fervant fighters there. It's the religion and Imaams that tells Muslims to kill Jews. It's the fundamentalists that are suicide bombing. Almost every muslim country in Middle-East has declared that Israel must be wiped from the face of the earth. It's written in the founding document of Palestine. These thought are indeed prominent. The only reason why Israel is not in open war, is that USA supports them and Israel might have nukes and they would certainly use them, if they were cornered. And arabs know this.
How come is it, that it's the religious republicans that are always proponents of death penalty, opponents of taxes and social welfare to help the ones in need, judging gay people, judging those with other beliefs... WWJD?
"But a short time elapsed after the death of the great reformer of the Jewish religion, before his principles were departed from by those who professed to be his special servants, and perverted into an engine for enslaving mankind, and aggrandizing their oppressors in Church and State." -Thomas Jefferson