If the islamists take over they will, of course, be tyrants but that doesn't change the fact that Mubarak and company are tyrants as well. Revolution is a dangerous game but the people are clearly past the point where the "evils are sufferable". A year from now they may find that they made a terrible choice but I find it hard to be critical of people who want out from under a dictator.
they simply trade the devil they know for a devil they don’t know. They will not be “out from under a dictator” because middle eastern Muslims are, for the most part, incapable of living in a Democracy. The ME has become a breeding ground for militant islamic fundamentalism and, rest assured, the agitators are walking amongst those young men feeding their anger and hatred, nourishing their greivances, sowing the seeds of war and ruin. This will end badly for everyone.