While this is generally true of a certain American political party, you see hard cutoff lines even in states like Massachusetts, where the majority of voters and politicians seem to be actively trying to make things better for people.

The real answer is that gradients are hard, and clear lines are easy. A shocking number of Americans don't understand how our income tax brackets work; they believe that if you cross the line into a higher income bracket, your entire income is taxed at that new, higher rate, and you end up losing money overall.

Massachusetts, which has the highest percentage of college educated citizens in the entire country, also shot down ranked choice voting last year, because the math was too hard.