> This is a question in good faith. Can you provide any evidence at all that Parler had more “hate” than Twitter, etc.?

The problem isn't just that they had more, though logic would suggest they did; after all, their user base are refugees from other platforms that pushed them out for extremist language, advocating for violence, conspiracy theories, etc.

It's that Parler refused to remove it.

So even if the rate of introduction of this content was the same on Parler (which I don't buy for a second, see argument above), the total concentration and visibility of it is higher because it's not taken down.