Dictator-like behavior has a polarizing effect, which is generally the precursor to large realignments (and possibly violence). On that note: please be careful!

"The more you tighten your grip, the more star systems will slip through your fingers." - Stars Wars Episode 4

Large realignments are the fallout: those who benefit from the dictatorship will be in favor of it. Dictators also have difficulty maintaining their grip on power.