UNRWA teacher teaches his kids to violently overthrow Israel

Hasan Musleh is an UNRWA teacher in Jordan.

Of course he teaches his children in class that they will one day "return" to the areas of British Mandate Palestine that are in Israel today. Here's the blackboard of his classroom with the representation of a key that is symbolic of this desire to "return": On the board he wrote "15th of May 1948," which he calls Nakba Day,

And how is this "return" supposed to be accomplished?

He answers that on his Facebook pages as well, with his ideal display of unity:

The three major terror groups of Fatah, Islamic Jihad and Hamas are represented here.

Does UNRWA expect people to believe that Musleh doesn't teach his students the message of the poster?

(h/t Ibn Boutros)

UPDATE: These specific photos have been taken down, but Musleh still has others that show that he believes in violence: