Yes, when you let your political ideology rule your life, there isn't anything else. And you want to indoctrinate as many people, including children (they are the easiest to manipulate) to their way of thinking, create a kind of army to go up against the things they don't like.
And again I think it's all about the money. Getting paid to teach indoctrination and not have to work so hard, over teaching educational skills that will benefit the students throughout their lives. And we see which choice they made.