Hi David! Take a look at my correction for you:
The party is totalitarian, and doesn't treat people as citizens, but rather ignorant children unworthy of respect.
You wouldn't use the word 'existence' in that sentence because the word 'totalitarian' already describes a state of existence. Also, don't forget to add commas after 'totalitarian' and 'citizens'.
Let me know what you think. I hope that helps!