The United States went through horribly painful episodes after the establishment of it's own democracy. It even tore itself apart less than 100 years after independence in the civil war. Democracy takes time to change a society, but even in its most flawed form, even if it elects islamists, is better than any form of dictatorship. Moreover, the arabs know full well what can happen if they elect islamists, they were not blind to what happened in Iran with those voted in entrenching themselves into an even worse dictatorship than what it replaced. For as developmentally behind as they are, they're not entirely blind.
Roadside bomb kills five border officers in western Iraq (AP)
from the article: Arab Spring will just bring upon Islamist dictatorships