When peace and harmony are an option, they are the best option. Unfortunately, unrest complicates things; maybe a revolution would improve a bad situation, or a small war distract people from it. So break out the popcorn and political prisoners: here’s a brief guide to causing one.
Step one is to make some enemies. When you’re starting a conflict, the danger isn’t the people fighting against you; it’s people not fighting you. Even if you can’t convince everyone to join your side, persuade them that they have to pick some side — otherwise you’ll be left with a painful ceasefire. “You’re either with us or against us” is a time-honoured tactic to deploy.
Next up is to pretend that killing and fighting is the moral choice. Pretend we have the high ground, perhaps maintaining that we are retaliating for what ‘they’ did to us. You’d be hard pressed to find a successful revolutionary that didn’t believe they were in the right.
The enemy should be thought of as inhuman, and thus acceptable to murder. Turn them into cold bodies rather than living breathing people — both physically and figuratively.
Give us hope that things can change for the better. You may have heard that civil instability is not so prominent when times are tough, but when things are worsening. Nostalgic memories of the past feel like proof that we could return to those times, if we could only make the necessary change. It hints that victory is possible.
Assuming all goes to plan, you will have kindled a clear-cut faction that despises outsiders for their supposed lack of morals and that believes they can change the world. After that, keep escalating until you get to the top.
The last step is the most difficult. It’s the one Stalin got wrong.
Once fierce loyalists have defeated all enemies and believe themselves to be superior leaders, you’ve got to stop: look back at the bodies you’ve made from your species, and admit you were wrong.

Image edited from Julius Caesar (1953) at 13:21.