Unfortunately Oliver Cromwell was a tyrant.
It took the dreadful experience of a living hell for the English to realize that a fey King with a Parliarment to check and balance his royal powers was far better government than a tyrannical religious nut.
I suspect the Arabs will have to experience the same thing (like the Iranians and the Iraqis) before they finally understand that a representative govenment with personal liberty isn't evil.