> So, with that thinking, if your hypothetical came true, then those who thought killing Jews was wrong would be 'bad,' and those who thought killing Jews was 'right,' would be inline with what society thought and therefore be 'good?!?'

Is that what you believe?!?

There's no need for hypotheticals. This is what the majority of Christians believed until quite recently, isn't it?
http://www.ccel.org/fathers/ANF-01/just/justtryindex.html
http://www.fordham.edu/halsall/source/chrysostom-jews6.html
http://www.fordham.edu/halsall/source/luther-jews.html