Parler was not a "hate site." It's a social media platform that chose to take a reactive rather than proactive approach to policing illegal behavior, and experienced the growing pains of an up-and-comer advertising itself as a Twitter alternative that then had to deal with a flood of Twitter refugees during a political crisis.
The overwhelming vast majority of the people on Parler were simply normal people tired of what they perceived as a double standard in Twitter's treatment of conservatives as opposed to liberals, and wished to support a competitor.