Agreed. The only part of that banner that is not literally true is the penguin -- Saudis do wear traditional dress and it is completely appropriate to point out

Agreed. The only part of that banner that is not literally true is the penguin -- Saudis do wear traditional dress and it is completely appropriate to point out that many things we do not consider a crime in most of the rest of the world are punishable by very, very unpleasant actions. It's worth mentioning that just because the police are investigating it does not mean that they've decided to charge anyone; nor that the poster's owners would be found guilty in court. I really doubt this later point -- the factual and political aspects are quite a strong defence.