They have too much control. This, among other reasons, is why I plan on homeschooling my future progeny.
Sources
How Texas Inflicts Bad Textbooks on Us (Gail Collins)
Texas Conservatives Win Curriculum Change (James C McKinley Jr)
5 Reasons The New Texas Social Studies Books Are Nuts (Dianna Wray)
Texas: We Don’t Need AcademicsTo Fact Check Our Textbooks (Story Hinckley)
Here’s How New Texas Public School Textbooks Write About Slavery (Bobby Finger)