I don't mind Parler being deplatformed as long as similar standards are held for others. Given that Facebook was also a major contributor to the organizing of January 6th I think it makes sense people were asking for their deplatforming as well. That never happened though, and goes unanswered w.r.t. the logic that you've shared.

But they define dangerous content as anything right leaning, and lack of moderation as lack of deletion of said content.

The definition of “dangerous” has become rather flimsy these days.