Sudan : Another prove that procession against any bad ruler doesn't bear any good fruit. You remove the tyrant and a lawlessness will cover the land creating a million tyrants.
Even this can be explained by "every nation gets the ruler it deserves" saying. The tyrant was there in the first place because the people of this land deserved one.
So what should a Muslim's position be in this situation? Hadith calls for "support the ruler, but dislike his evil deeds." But that's a hard task to hate the evil deeds of a ruler but still be supportive of him.
Which is why Muslim saints call for "don't approach the ruler for anything, rather keep your distance". As power corrupts, so does proximity to power.
By the end of it all, I would be asked about my deeds in life, and not my boss's or my ruler's.