Years ago, when I was taking my college sociology class, I learned that people in free nations will ignore irrational rules and laws. It seems that we have a good number of teachers who understand they are primary "transmitters" of knowledge from one generation to the next, who are unwilling to spread an unproven theory as truth, ruling out all others thoughts or ideas. God bless them and more power to them!
There is more evidence/data for the theory of evolution than gravitational theory.