In this world of life, there seems to be a natural law that certain things will never go together. To name a few:
Muslim and Jews
Water and oil
smoking and gas station
Pork and Muslim
:
:
Communist and Democracy
It goes against some kind of natural law for any pair of those 2 things to go together. It may happen but so far at this point of civilization of mankind, the law still hold true.
Sorry for being philosophical