Well I agree that banning ‘promoting divisive concepts’ is nowhere near specific enough for any law. You couldn’t enforce that. Really any prohibition on teaching CRT or other ideologies in a non-critical way should be drafted in detail.
My guess is they are not drafting the language specifically so as to keep the pretext of fairness. Drafting the law broadly also allows them to apply it to the next concept they don't like.
Really though, it's the spirit of the law that gives me pause. In education, isn't it more important to teach things that are TRUE than things that are "non-divisive"? I could see this law, for example, being used to promote a "Lost Cause" style narrative for the Civil War, because after all, it might be "too divisive" to teach the truth-- that the main objective of the Confederacy was to preserve slavery. The other term used to describe these "divisive concepts" is "un-American." Does that mean we can't teach the kids the truth about how America entered several major wars based on untrue reasons (the Maine, Gulf of Tonkin, WMDs, etc.)? Does "divisiveness" also preclude any critical discussion of current politics, given the essentially divided state of the country? For example, if Biden decides to go to war with Iran, are teachers not allowed to discuss it with their students because, given the emotions that war inherently triggers, such a discussion itself is intrinsically divisive?
No, it's a bad law passed for bad reasons.
If you take them at their word, they are mandating a nationalistic, whitewashed view of American history and current events (which too many students get anyways, thanks to ridiculously anodyne textbooks).
If you think that "non-divisive" is just the pretext used to target one specific concept-- Critical Race Theory-- then it is unfairly targeting on potentially divisive idea among many.
I highly doubt they'll be teaching "one racial view among many". The current respectable contenders are color blindness, which ignores history and context, and whatever this new thing is, which frankly seems to change too fast to clearly describe but seems to boil down to racial essentialism.
Since you meet only individuals in your day to day life, not golems composed of statistical averages or walking amalgams of collective racial trauma, the former seems psychologically much healthier than the later. It's a Nietzschean way to look at it- does it serve life or not?
This is, though, essentially an argument against entire fields of study in the humanities-- anthropology, to some extent, which is based on cultural distinctions; and sociology almost entirely since it is based on statistical norms.
I agree that trying to apply statistical norms to individual situations is a stupid way to live your daily life, but I am also loathe to throw out the statistical analysis of populations for this reason.
It is also stupid to treat individuals as mere "products of history," but neither does this invalidate the study of history.