[ordinary]

There is no such thing as a liberalism gene. Cultural evolution plays a much larger part in the development of human society than traditional biological evolution does. "Caucasians", insofar as that term has any scientific basis in fact, might be on the decline. Liberal society is not.

[smm2000]

It's only true if conservative=>liberal conversion continues in future which is not necessarily true. Currently liberal societies generally outperform conservative ones but historically it was often not the case.

Just look at Siege of Baghdad by mongolian hordes or depopulation and fall of Roman Empire.