UNRWA school principals support terror, celebrate Jewish deaths (update)

Mamoun Abunaser is a principal at an UNRWA school in Syria. His profile picture on Facebook says, "When injustice becomes law, resistance becomes duty."

Is it a UN principle for principals to support terror?

Abu Mohammed al-Madhoun is also an UNRWA school principal, heading a school in Gaza . He has this cartoon on his Facebook page, showing a caricature of a religious Jew being imprisoned in a box that is locked with the symbolic Palestinian Arab key.

Luay Shehab is a UNRWA school principal in Nablus. He triumphantly shows photos of dead Israelis on his Facebook page.

UPDATE: The caption says "Oh Allah, make the number of their dead as [every time a Muslim says] "Amen"!

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Hassan Zeghan, isn't a principal; he is only a UNRWA teacher in Hebron.  But notably he uses this as his profile picture:

He is also a fan of  Hamas' Qassam Brigades:

And another photo of his gunslinging idols in Hamas:

(h/t Ibn Boutros)