Were they aware that the festival was engaging in blacklisting?
From Al Masry al-Youm:
Organizer of the Cairo International Film Festival, Ezzat Abu Auf has said that he will not allow Israel to participate.In Arabic, he said it a little stronger: "I will not allow this to happen [any Israeli films at the festival] as long as I live."
"I will not allow Israel to intrude into the festival even if I have to sleep on the doorstep to keep them out," Abu Auf told reporters on Thursday evening,
It is a shame that this was not publicized in the English-language media before the festival. It would have been interesting to ask the stars whether they felt it was appropriate for them to support an event where Israelis are banned.