The presence of harassment and hate speech has a chilling effect on normal users - they aren't here to engage or fight nazism.
Without effective moderation, you will end up with Godwin's law applied to all convos.
But with automation you can ban hate speech! Awesome! You can stop bigotry and harassment! Brilliant!
You can enforce ideological views over your sub and crush dissent - whoops?
No, you cannot escape this conundrum - tools will be misused. The issue then becomes one of ethics and the appropriateness of the force used.