I see it as a distinction between criminal justice and war.
Do you really consider the war to be over after seizing power in one country?
Socialism itself is a stage of war. Its entire existence is informed by the conflict between proletariat and bourgeoisie and that war is only truly over when the bourgeoisie are marginalised worldwide to the point that counterrevolution is impossible.
At some point the war will hopefully be over but there is still a long way to go from the establishment of socialism somewhere to the end of capitalism everywhere.
This is why socialist societies needs to be watchful as they will be under constant attack.
Do you really consider the war to be over after seizing power in one country?
Socialism itself is a stage of war. Its entire existence is informed by the conflict between proletariat and bourgeoisie and that war is only truly over when the bourgeoisie are marginalised worldwide to the point that counterrevolution is impossible.
At some point the war will hopefully be over but there is still a long way to go from the establishment of socialism somewhere to the end of capitalism everywhere.
This is why socialist societies needs to be watchful as they will be under constant attack.