I guess the most important thing to remember right now is that we don't know what government is going to emerge from the revolutions in Tunisia and Egypt. Some are hopeful that this is some sort of Arab Enlightenment, the beginnings of new democracy in Muslim North Africa. Others are worried that militant Islamists will have an opening.
Maybe it's simplistic, but I tend to believe dictators are always worth overthrowing. The possibility of democracy is worth the risk of Islamist takeover.