Petty tyrants like Mubarak were put into place by those who desire control and ultimately would have a One-World Government.  It is just as important to understand how and why Mubarak came to power, and what purpose he has served over the last 30 years, as it is to understand why he now must go. 

As long as the interests of those "in charge" are fully supported, the appointee will reign.  And when they have served their purpose, or become too head-strong or self-important to follow the directive, they must go.  Is this what is happening in Egypt?  Only time will tell.  But, it is prudent to observe the events in Egypt with caution, not exuberance.  Although it is very hip to support the populous uprising and declare that Egypt must have local democracy, we must understand that this process is ultimately a home-grown initiative lead by the people of the country, in their time, when it is right for them.  You cannot thrust democracy on a people who are not ready for it.  That is an invitation for disaster.

Coups or other regime changes in areas of extreme volatility as the Mideast result in great uncertainty for the region and the rest of the world; not the kind of event one would generally desire.  But then again, destabilization of economies and nations may serve a purpose for some.  Who?  Be skeptical.  Free elections in newly formed governments are rarely unbiased nor without corruption.  Ask yourself who will benefit from the upcoming events, and how.  What impact may that have on you?

Do not blindly endorse this.  Become aware of the possible consequences.  Study history.