Slightly off-topic, but I think it's important to recognize that Parler was placed in the unfair position of having to perfect it's moderation systems in a very short time as their user base ramped up exponentially. Twitter et al had a lot of time to work out their issues and their moderation strategy has 'evolved' substantially over time (and it is still not optimal). I've not seen any messages from Parler defiantly saying they would not try to moderate violent content. If they were not 100% successful, I'd chalk that up to growing pains. Twitter was never subjected to the same level of compliance. Parler was punished for political reasons.