This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...f crimes does not give a policeman the right to engage in criminal activities, so the invasion and destruction of a dictatorship does not give the invader the right to establish another variant of a slave society in the conquered country.

A slave country has no national rights, but the individual rights of its citizens remain valid, even if unrecognized, and the conqueror
has no right to violate them. Therefore, the invasion of an enslaved country is morally justified only when and if the conquerors establish a free social system, that is, a system based on the ...
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