You tell me!/sarc
Not all Arabs want that.
That's why I said the " Arab street" tends towards nutjob, while the Arab leaders are afraid/opposed.
After the war with Hezbullah (Shia Iran-proxie) Nasrallah was ranked as the most popular man in the Arab (Sunni) world.
Iran in it's propaganda is playing heavily on Arab pan-Islamic sympathies. They portray themselves as the true friends of Palestine (Hamas... Iran-proxy and Sunni Arab).
Many (not all... by far) Arab Muslims would like to see Iran do away with Israel. Hence the loud rhetoric from Iran.
But for exactly the reasons you gave... the Arab leaders and many of their subjects don't want to see Iranian nukes.
Yes, Arabs would like Persians to “take out the trash (Israel).” Bad news is that for the Persians to have that capability also gives them the power to threaten every other regime in the neighborhood. Rational people would figure out that it’s not worth it. OTOH don’t count on rationality in the ME.