The reason, of course, is that these schools are catering to religious Jews, whose acceptance of evolution is inversely proportional to their religiosity. The government may deny that, but I can’t see any other reasons. The school system is not supposed to dumb down its curriculum to avoid offending the religious.
This is actually a common result of making this debate too contentious. Was the Scopes Trial a failure or success for those opposing evolution?
One the one hand, they lost, and could not legally stop teaching evolution in public schools.
On the other hand, the trial was such a mess that public schools stopped teaching evolution any ways, to avoid the controversy.
So they lost, but they won. This is all the more reason we need to press for a less contentious approach to the conversation.