An insult. ? Gee thanks. I'm sorry you feel sorry for my kids because when I buy them books it is to read. Not to push a political agenda. And you might want to check out Will Durant. He's pretty interesting.
When a person is being educated we're going for meta-cognition and engaging the learner and encouraging learning for life. We're not trying to ram an agenda down their throats. A book, that is given to students to read in a reading class should not be focused so much on politics because there are other things that are being taught. When you teach a 9th grader, you are encouraging them to spread their wings as readers and writers themselves. Encouraging them to explore character development and plot, theme and genre. A person who wants a kid to read Mark Twain to see the reality of racism in the US, is making it political literature.
I disagree with that approach. I think high school students have a priority to learn to understand literature. Choosing a topic that creates a disengage is a bad strategy.
I guess, to take all my blathering and make it short, I'm saying that there is a short amount of time for students to learn these skills and if it gets crowded out of the way to discuss politics, it is a disadvantage to the students themselves.