I read in a British magazine called 'economist' that the Arabs don't want Iran to have nuclear technology. I don't know why exactly. It could be they are uncomfortable with Iran's intensions in the region, and feel Iran might wish to threaten their goverments and be protected by its' nuclear technology.
Thousands gather in Kuala Lumpur for rally urging Malaysian leader to quit (AP)
from the article: Mossad killing of terror chiefs has little impact on Israel-Hamas war