People tend to suggest that teaching in a traditional way, is unbiased and therefore politically neutral, whereas progressive teaching, or teaching from progressive texts is anti-tradition and therefore politically biased.
This is yet another example of how we allow the right wing to determine where the conversation is.
If the above were true, then the only options would be to be normal and neutral, or to be left wing, that model does not allow for a right wing bias.
Obviously this is ridiculous. Teaching in the traditional way is biased. Not taking sides IS taking a side (and almost always a conservative one). And it's garbage that we are made to think otherwise.