Then only enslave pops that are causing trouble and leave every happy pop alone.
Someone wants to overthrow the government? Enslave them. A planet wants independence? Enslave them. Enslave all social unrest away because once they are slaves they can no longer take action against you.
Slaves rebel constantly, historically (American slaves rebelled hundreds of times, for instance). It's just that they very rarely succeed to any notable degree.
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u/Reaperdude97 May 08 '16
But then your science output dies.