The arabs wherever they are should get tsunami, deluge, avalanche, typhoons, cyclones, hurricanes, tornado, earthquakes, super volcanoes, earth crust shifting, sinking of tectonic plates, poisonous gases from volcano, heavy snow fall, ice age formations etc. and global warming.
The only calamities I don't want for arabs is to get the shift in earth axis and heavy rains so that they are never placed better.