This is actually a contradiction in conservative thought that I've been thinking about quite a bit. Conservatives normally have no problem accepting systemic logic, especially when it comes to economics. As far as I can tell, evolution versus ID is the sole exception to this. Of course, this explains why the evolution versus ID "debate" (I know that there are several who are opposed to even calling it a "debate") rages as fiercely as it does even at the epicenter of conservative thought on the Internet.
Yeah, I've been reading a lot of Thomas Sowell lately.