If the people were consistent in their rejection of science, the world would be a very different place. The Industrial Revolution would have stalled in the early 1800s, no green revolution, no modern medicine - very little of what we have today. The average lifespan would probably be where it was back then - 35 to 40 years.
One can only conclude some of the Republicans don't think and others are motivated by greed. It isn't clear what kind of Republican Scott Pruitt is in .. possibly both.