Imagine that was done here (in the US), those teachers might get a talking to, but nobody would buy that they're teaching hate unless students or observers say something.
If someone were to scrub your social media accounts, would they find 0 likes or shares of 'hateful content'? Depending on who you follow, that could be anything from sharing videos of the IDF's attacks, Hamas' attacks, Likud's charter, or even some dude that edited their viral post to inject something positive about Mein Kampf